Samples can't have the same asset file names across components

### Describe the bug

_[originally discovered here](https://github.com/CommunityToolkit/Labs-Windows/pull/354#issuecomment-1487539780)_

```
"D:\a\Labs-Windows\Labs-Windows\CommunityToolkit.AllComponents.sln" (default target) (1:2) ->
"D:\a\Labs-Windows\Labs-Windows\tooling\ProjectHeads\AllComponents\Tests.WinAppSdk\CommunityToolkit.Tests.WinAppSdk.csproj" (default target) (27:6) ->
(_HandleFileConflictsForPublish target) ->
C:\Program Files\dotnet\sdk\6.0.407\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.ConflictResolution.targets(112,5): error NETSDK1152: Found multiple publish output files with the same relative path: D:\a\Labs-Windows\Labs-Windows\components\Shimmer\samples\Assets\Owl.jpg, D:\a\Labs-Windows\Labs-Windows\components\TransitionHelper\samples\Assets\Owl.jpg. [D:\a\Labs-Windows\Labs-Windows\tooling\ProjectHeads\AllComponents\Tests.WinAppSdk\CommunityToolkit.Tests.WinAppSdk.csproj]

"D:\a\Labs-Windows\Labs-Windows\CommunityToolkit.AllComponents.sln" (default target) (1:2) ->
"D:\a\Labs-Windows\Labs-Windows\tooling\ProjectHeads\AllComponents\WinAppSdk\CommunityToolkit.App.WinAppSdk.csproj" (default target) (29:6) ->
C:\Program Files\dotnet\sdk\6.0.407\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.ConflictResolution.targets(112,5): error NETSDK1152: Found multiple publish output files with the same relative path: D:\a\Labs-Windows\Labs-Windows\components\Shimmer\samples\Assets\Owl.jpg, D:\a\Labs-Windows\Labs-Windows\components\TransitionHelper\samples\Assets\Owl.jpg. [D:\a\Labs-Windows\Labs-Windows\tooling\ProjectHeads\AllComponents\WinAppSdk\CommunityToolkit.App.WinAppSdk.csproj]
```

In this case we had two components **Shimmer** and **TransitionHelper** which had a `samples\Assets\Owl.jpg` file. When the build went to include both these components it got confused.

----

We need to better identify this issue locally with an analyzer to alert a dev as an error during development (duplicate file name across repo) [easier?] or figure out how to merge resources into a cohesive collection which can still work for all the code relying on those images [hard?].

### Steps to reproduce

```text
Create two components
Setup an image with the same name in both sample directories and include in project
Try and build the all-up solution
```

### Expected behavior

Able to _either_:
- identify duplicates across components and alert developer
- use assets with the same name

### Screenshots

_No response_

### Code Platform

- [ ] UWP
- [ ] WinAppSDK / WinUI 3
- [ ] Web Assembly (WASM)
- [ ] Android
- [ ] iOS
- [ ] MacOS
- [ ] Linux / GTK

### Windows Build Number

- [ ] Windows 10 1809 (Build 17763)
- [ ] Windows 10 1903 (Build 18362)
- [ ] Windows 10 1909 (Build 18363)
- [ ] Windows 10 2004 (Build 19041)
- [ ] Windows 10 20H2 (Build 19042)
- [ ] Windows 10 21H1 (Build 19043)
- [ ] Windows 11 21H2 (Build 22000)
- [ ] Other (specify)

### Other Windows Build number

_No response_

### App minimum and target SDK version

- [ ] Windows 10, version 1809 (Build 17763)
- [ ] Windows 10, version 1903 (Build 18362)
- [ ] Windows 10, version 1909 (Build 18363)
- [ ] Windows 10, version 2004 (Build 19041)
- [ ] Other (specify)

### Other SDK version

_No response_

### Visual Studio Version

_No response_

### Visual Studio Build Number

_No response_

### Device form factor

_No response_

### Additional context

Maybe we should also think about some centralized assets that all samples have access to in case they just need an image or two to include?

### Help us help you

Yes, but only if others can assist.