XIB files are not copied from the referenced executable project

### Apple platform

macOS

### Framework version

net8.0-*, net9.0-*

### Affected platform version

.net 9.0.203

### Description

Note: I'm not sure if this should be fixed. However, it may be reasonable to add a compile-time error or warning.

During quick prototyping, I accidentally referenced the executable project instead of the class library. I was able to successfully reuse the code from this project, but I was not able to use the xib-s interface definitions because xib files was not copied to the final app bundle.

The expected behavior may be one of the following
* copy the xib files from all referenced projects;
* do not allow references to executable projects. Add the corresponding compiler warning or error.

### Additional notes
I believe that is pretty strange to reference the executable project, but there are a few nuances:
* tooling (xcsync, Rider) can't handle the UI in the class libraries. The corresponding classes are simply not visible in XCode when the "Edit with XCode" action. So, some people may try to reference executable projects to workaround the tooling issues.
* IDE hotfixes.I encountered this issue after the Rider told me something like "Foo is undefined. Let's reference the AnotherApp.csproj and add the missing using directives to fix this".

### Steps to Reproduce

* Open test project [UiFromExecutable.zip](https://github.com/user-attachments/files/20579407/UiFromExecutable.zip)
* run the `AppToReference` project and make sure it run and works - you can see the `NSCollectionView` with a buttons (one button for each collection item)
* run the `UiFromClassLib` and find the exception telling "could not dequeue an item of kind: NSCollectionElementKindItem with identifier MyItem - must register a nib or a class for the identifier, or name a nib or class to match the identifier"

Full exception text

ObjCRuntime.ObjCException: Objective-C exception thrown. Name: NSInternalInconsistencyException Reason: could not dequeue an item of kind: NSCollectionElementKindItem with identifier MyItem - must register a nib or a class for the identifier, or name a nib or class to match the identifier
Native stack trace:
0 CoreFoundation 0x000000018a14727c __exceptionPreprocess + 176
1 libobjc.A.dylib 0x0000000189c2a158 objc_exception_throw + 60
2 Foundation 0x000000018b2bb1cc -[NSCalendarDate initWithCoder:] + 0
3 AppKit 0x000000018e3bb2e4 -[_NSCollectionViewCore _dequeueReusableViewOfKind:withIdentifier:forIndexPath:viewCategory:] + 1244
4 AppKit 0x000000018e3bbd84 -[_NSCollectionViewCore dequeueReusableItemWithReuseIdentifier:forIndexPath:] + 84
5 AppKit 0x000000018dacf678 -[NSCollectionView makeItemWithIdentifier:forIndexPath:] + 88
6 UiFromClassLib 0x000000010416b2d0 xamarin_dyn_objc_msgSend + 160
7 ??? 0x00000003012701e8 0x0 + 12904235496
8 ??? 0x000000030126fbb0 0x0 + 12904233904
9 ??? 0x000000030126f974 0x0 + 12904233332
10 ??? 0x0000000301853874 0x0 + 12910409844
11 ??? 0x0000000300492e18 0x0 + 12889697816
12 ??? 0x00000003004ad234 0x0 + 12889805364
13 ??? 0x0000000301257918 0x0 + 12904134936
14 ??? 0x0000000301256e64 0x0 + 12904132196
15 ??? 0x0000000301256ccc 0x0 + 12904131788
16 UiFromClassLib 0x0000000104154b54 xamarin_bridge_runtime_invoke_method + 132
17 UiFromClassLib 0x00000001041665f4 mono_runtime_invoke + 72
18 UiFromClassLib 0x0000000104163fa8 xamarin_invoke_trampoline + 6072
19 UiFromClassLib 0x000000010416a3c0 xamarin_arch_trampoline + 148
20 UiFromClassLib 0x000000010416b1a4 xamarin_arm64_common_trampoline + 64
21 AppKit 0x000000018dacf508 -[_NSCollectionViewDataSourceAdapter collectionView:itemForRepresentedObjectAtIndexPath:] + 220
22 AppKit 0x000000018e3afaf8 -[_NSCollectionViewCore _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:isFocused:notify:] + 100
23 AppKit 0x000000018e3b24c8 -[_NSCollectionViewCore _updateVisibleCellsNow:] + 3156
24 AppKit 0x000000018e3b6204 -[_NSCollectionViewCore _layoutItems] + 212
25 AppKit 0x000000018dac3138 -[NSCollectionView layout] + 304
26 AppKit 0x000000018e3dfe30 ___NSViewLayout_block_invoke + 592
27 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
28 AppKit 0x000000018d97903c _NSViewLayout + 96
29 AppKit 0x000000018e3d64dc __36-[NSView _layoutSubtreeWithOldSize:]_block_invoke + 364
30 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
31 AppKit 0x000000018d978fd0 -[NSView _layoutSubtreeWithOldSize:] + 100
32 AppKit 0x000000018e3d6620 __36-[NSView _layoutSubtreeWithOldSize:]_block_invoke + 688
33 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
34 AppKit 0x000000018d978fd0 -[NSView _layoutSubtreeWithOldSize:] + 100
35 AppKit 0x000000018e3d6620 __36-[NSView _layoutSubtreeWithOldSize:]_block_invoke + 688
36 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
37 AppKit 0x000000018d978fd0 -[NSView _layoutSubtreeWithOldSize:] + 100
38 AppKit 0x000000018e3d6620 __36-[NSView _layoutSubtreeWithOldSize:]_block_invoke + 688
39 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
40 AppKit 0x000000018d978fd0 -[NSView _layoutSubtreeWithOldSize:] + 100
41 AppKit 0x000000018e3d6620 __36-[NSView _layoutSubtreeWithOldSize:]_block_invoke + 688
42 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
43 AppKit 0x000000018d978fd0 -[NSView _layoutSubtreeWithOldSize:] + 100
44 AppKit 0x000000018e3d6fc4 __56-[NSView _layoutSubtreeIfNeededAndAllowTemporaryEngine:]_block_invoke + 796
45 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
46 AppKit 0x000000018d978b90 -[NSView _layoutSubtreeIfNeededAndAllowTemporaryEngine:] + 100
47 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
48 AppKit 0x000000018d978b20 -[NSView layoutSubtreeIfNeeded] + 96
49 AppKit 0x000000018e681850 -[NSWindow(NSConstraintBasedLayoutInternal) _layoutViewTree] + 104
50 AppKit 0x000000018e6819d8 -[NSWindow(NSConstraintBasedLayoutInternal) layoutIfNeeded] + 240
51 AppKit 0x000000018d9d7754 __NSWindowGetDisplayCycleObserverForLayout_block_invoke + 364
52 AppKit 0x000000018d9d6cec NSDisplayCycleObserverInvoke + 168
53 AppKit 0x000000018d9d6948 NSDisplayCycleFlush + 644
54 QuartzCore 0x00000001922ca76c _ZN2CA11Transaction19run_commit_handlersE18CATransactionPhase + 120
55 QuartzCore 0x00000001922c950c _ZN2CA11Transaction6commitEv + 320
56 AppKit 0x000000018da5aac8 __62+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayLink]_block_invoke + 272
57 AppKit 0x000000018e41b4e4 ___NSRunLoopObserverCreateWithHandler_block_invoke + 64
58 CoreFoundation 0x000000018a0d180c __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36
59 CoreFoundation 0x000000018a0d16f8 __CFRunLoopDoObservers + 536
60 CoreFoundation 0x000000018a0d0d24 __CFRunLoopRun + 776
61 CoreFoundation 0x000000018a0d03c4 CFRunLoopRunSpecific + 608
62 HIToolbox 0x000000019487d19c RunCurrentEventLoopInMode + 292
63 HIToolbox 0x000000019487ce2c ReceiveNextEventCommon + 220
64 HIToolbox 0x000000019487cd30 _BlockUntilNextEventMatchingListInModeWithFilter + 76
65 AppKit 0x000000018d931cc8 _DPSNextEvent + 660
66 AppKit 0x000000018e1284d0 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 700
67 AppKit 0x000000018d924ffc -[NSApplication run] + 476
68 AppKit 0x000000018d8fc240 NSApplicationMain + 880
69 ??? 0x000000030125319c 0x0 + 12904116636
70 ??? 0x0000000301252e90 0x0 + 12904115856
71 ??? 0x000000030124aa20 0x0 + 12904081952
72 libcoreclr.dylib 0x0000000105dabab8 CallDescrWorkerInternal + 132
73 libcoreclr.dylib 0x0000000105c2f794 _ZN18MethodDescCallSite16CallTargetWorkerEPKyPyi + 832
74 libcoreclr.dylib 0x0000000105b33a9c _Z7RunMainP10MethodDescsPiPP8PtrArray + 624
75 libcoreclr.dylib 0x0000000105b33df8 _ZN8Assembly17ExecuteMainMethodEPP8PtrArrayi + 268
76 libcoreclr.dylib 0x0000000105b5843c _ZN8CorHost215ExecuteAssemblyEjPKDsiPS1_Pj + 640
77 libcoreclr.dylib 0x0000000105b234b4 coreclr_execute_assembly + 232
78 UiFromClassLib 0x0000000104166318 mono_jit_exec + 204
79 UiFromClassLib 0x000000010416a274 xamarin_main + 884
80 UiFromClassLib 0x000000010420aac8 main + 64
81 dyld 0x0000000189c67154 start + 2476

at ObjCRuntime.Messaging.NativeHandle_objc_msgSend_NativeHandle_NativeHandle(IntPtr receiver, IntPtr selector, NativeHandle arg1, NativeHandle arg2)
at AppKit.NSCollectionView.MakeItem(String identifier, NSIndexPath indexPath) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/build/dotnet/macos/generated-sources/AppKit/NSCollectionView.g.cs:line 865
at AppToReference.TestCollectionViewDataSource.GetItem(NSCollectionView collectionView, NSIndexPath indexPath) in /Users/sergey/Downloads/UiFromClassLib/Shared/TestCollectionViewDataSource.cs:line 51
at InvokeStub_TestCollectionViewDataSource.GetItem(Object, Span`1)
at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
Native stack trace:
0 CoreFoundation 0x000000018a14727c __exceptionPreprocess + 176
1 libobjc.A.dylib 0x0000000189c2a158 objc_exception_throw + 60
2 Foundation 0x000000018b2bb1cc -[NSCalendarDate initWithCoder:] + 0
3 AppKit 0x000000018e3bb2e4 -[_NSCollectionViewCore _dequeueReusableViewOfKind:withIdentifier:forIndexPath:viewCategory:] + 1244
4 AppKit 0x000000018e3bbd84 -[_NSCollectionViewCore dequeueReusableItemWithReuseIdentifier:forIndexPath:] + 84
5 AppKit 0x000000018dacf678 -[NSCollectionView makeItemWithIdentifier:forIndexPath:] + 88
6 UiFromClassLib 0x000000010416b2d0 xamarin_dyn_objc_msgSend + 160
7 ??? 0x00000003012701e8 0x0 + 12904235496
8 ??? 0x000000030126fbb0 0x0 + 12904233904
9 ??? 0x000000030126f974 0x0 + 12904233332
10 ??? 0x0000000301853874 0x0 + 12910409844
11 ??? 0x0000000300492e18 0x0 + 12889697816
12 ??? 0x00000003004ad234 0x0 + 12889805364
13 ??? 0x0000000301257918 0x0 + 12904134936
14 ??? 0x0000000301256e64 0x0 + 12904132196
15 ??? 0x0000000301256ccc 0x0 + 12904131788
16 UiFromClassLib 0x0000000104154b54 xamarin_bridge_runtime_invoke_method + 132
17 UiFromClassLib 0x00000001041665f4 mono_runtime_invoke + 72
18 UiFromClassLib 0x0000000104163fa8 xamarin_invoke_trampoline + 6072
19 UiFromClassLib 0x000000010416a3c0 xamarin_arch_trampoline + 148
20 UiFromClassLib 0x000000010416b1a4 xamarin_arm64_common_trampoline + 64
21 AppKit 0x000000018dacf508 -[_NSCollectionViewDataSourceAdapter collectionView:itemForRepresentedObjectAtIndexPath:] + 220
22 AppKit 0x000000018e3afaf8 -[_NSCollectionViewCore _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:isFocused:notify:] + 100
23 AppKit 0x000000018e3b24c8 -[_NSCollectionViewCore _updateVisibleCellsNow:] + 3156
24 AppKit 0x000000018e3b6204 -[_NSCollectionViewCore _layoutItems] + 212
25 AppKit 0x000000018dac3138 -[NSCollectionView layout] + 304
26 AppKit 0x000000018e3dfe30 ___NSViewLayout_block_invoke + 592
27 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
28 AppKit 0x000000018d97903c _NSViewLayout + 96
29 AppKit 0x000000018e3d64dc __36-[NSView _layoutSubtreeWithOldSize:]_block_invoke + 364
30 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
31 AppKit 0x000000018d978fd0 -[NSView _layoutSubtreeWithOldSize:] + 100
32 AppKit 0x000000018e3d6620 __36-[NSView _layoutSubtreeWithOldSize:]_block_invoke + 688
33 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
34 AppKit 0x000000018d978fd0 -[NSView _layoutSubtreeWithOldSize:] + 100
35 AppKit 0x000000018e3d6620 __36-[NSView _layoutSubtreeWithOldSize:]_block_invoke + 688
36 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
37 AppKit 0x000000018d978fd0 -[NSView _layoutSubtreeWithOldSize:] + 100
38 AppKit 0x000000018e3d6620 __36-[NSView _layoutSubtreeWithOldSize:]_block_invoke + 688
39 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
40 AppKit 0x000000018d978fd0 -[NSView _layoutSubtreeWithOldSize:] + 100
41 AppKit 0x000000018e3d6620 __36-[NSView _layoutSubtreeWithOldSize:]_block_invoke + 688
42 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
43 AppKit 0x000000018d978fd0 -[NSView _layoutSubtreeWithOldSize:] + 100
44 AppKit 0x000000018e3d6fc4 __56-[NSView _layoutSubtreeIfNeededAndAllowTemporaryEngine:]_block_invoke + 796
45 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
46 AppKit 0x000000018d978b90 -[NSView _layoutSubtreeIfNeededAndAllowTemporaryEngine:] + 100
47 AppKit 0x000000018d9748fc NSPerformVisuallyAtomicChange + 108
48 AppKit 0x000000018d978b20 -[NSView layoutSubtreeIfNeeded] + 96
49 AppKit 0x000000018e681850 -[NSWindow(NSConstraintBasedLayoutInternal) _layoutViewTree] + 104
50 AppKit 0x000000018e6819d8 -[NSWindow(NSConstraintBasedLayoutInternal) layoutIfNeeded] + 240
51 AppKit 0x000000018d9d7754 __NSWindowGetDisplayCycleObserverForLayout_block_invoke + 364
52 AppKit 0x000000018d9d6cec NSDisplayCycleObserverInvoke + 168
53 AppKit 0x000000018d9d6948 NSDisplayCycleFlush + 644
54 QuartzCore 0x00000001922ca76c _ZN2CA11Transaction19run_commit_handlersE18CATransactionPhase + 120
55 QuartzCore 0x00000001922c950c _ZN2CA11Transaction6commitEv + 320
56 AppKit 0x000000018da5aac8 __62+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayLink]_block_invoke + 272
57 AppKit 0x000000018e41b4e4 ___NSRunLoopObserverCreateWithHandler_block_invoke + 64
58 CoreFoundation 0x000000018a0d180c __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36
59 CoreFoundation 0x000000018a0d16f8 __CFRunLoopDoObservers + 536
60 CoreFoundation 0x000000018a0d0d24 __CFRunLoopRun + 776
61 CoreFoundation 0x000000018a0d03c4 CFRunLoopRunSpecific + 608
62 HIToolbox 0x000000019487d19c RunCurrentEventLoopInMode + 292
63 HIToolbox 0x000000019487ce2c ReceiveNextEventCommon + 220
64 HIToolbox 0x000000019487cd30 _BlockUntilNextEventMatchingListInModeWithFilter + 76
65 AppKit 0x000000018d931cc8 _DPSNextEvent + 660
66 AppKit 0x000000018e1284d0 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 700
67 AppKit 0x000000018d924ffc -[NSApplication run] + 476
68 AppKit 0x000000018d8fc240 NSApplicationMain + 880
69 ??? 0x000000030125319c 0x0 + 12904116636
70 ??? 0x0000000301252e90 0x0 + 12904115856
71 ??? 0x000000030124aa20 0x0 + 12904081952
72 libcoreclr.dylib 0x0000000105dabab8 CallDescrWorkerInternal + 132
73 libcoreclr.dylib 0x0000000105c2f794 _ZN18MethodDescCallSite16CallTargetWorkerEPKyPyi + 832
74 libcoreclr.dylib 0x0000000105b33a9c _Z7RunMainP10MethodDescsPiPP8PtrArray + 624
75 libcoreclr.dylib 0x0000000105b33df8 _ZN8Assembly17ExecuteMainMethodEPP8PtrArrayi + 268
76 libcoreclr.dylib 0x0000000105b5843c _ZN8CorHost215ExecuteAssemblyEjPKDsiPS1_Pj + 640
77 libcoreclr.dylib 0x0000000105b234b4 coreclr_execute_assembly + 232
78 UiFromClassLib 0x0000000104166318 mono_jit_exec + 204
79 UiFromClassLib 0x000000010416a274 xamarin_main + 884
80 UiFromClassLib 0x000000010420aac8 main + 64
81 dyld 0x0000000189c67154 start + 2476

* inspect app bundle content `./UiFromClassLib/UiFromClassLib/bin/Debug/net9.0-macos/osx-arm64/UiFromClassLib.app/Contents/Resources` and find that `MyItem.xib` does not exists here (but exists in the app bundle for the `AppToReference`
* Note that in the `UiFromClassLib.ViewController` we explicitly referencing/instantiating the `TestCollectionViewDataSource` type from the `AppToReference`, so compiler should not optimize out the whole assembly.

### Did you find any workaround?

All works fine if all the UI will be in the current executable project or in the class library. Just do not try to reuse UI from the other executable project.

### Build logs

[msbuild.binlog.zip](https://github.com/user-attachments/files/20579417/msbuild.binlog.zip)