Runtime missing translation resource when `msbuild/*` code calls into `tool/*`

`Xamarin.Bundler.FileCopier` can throw errors that are not part of the msbuild (resgen) errors.

```
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(150,3): error MSB4018: The "CreateBindingResourcePackage" task failed unexpectedly.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(150,3): error MSB4018: System.Resources.MissingManifestResourceException: Could not find any resources appropriate for the specified culture or the neutral culture. Make sure "Errors.mtouch.resources" was correctly embedded or linked into assembly "Xamarin.iOS.Tasks" at compile time, or that all the satellite assemblies required are loadable and fully signed.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(150,3): error MSB4018: at System.Resources.ManifestBasedResourceGroveler.HandleResourceStreamMissing (System.String fileName) [0x00095] in /Users/builder/jenkins/workspace/build-package-osx-mono/2020-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/resources/manifestbasedresourcegroveler.cs:695
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(150,3): error MSB4018: at System.Resources.ManifestBasedResourceGroveler.GrovelForResourceSet (System.Globalization.CultureInfo culture, System.Collections.Generic.Dictionary`2[TKey,TValue] localResourceSets, System.Boolean tryParents, System.Boolean createIfNotExists, System.Threading.StackCrawlMark& stackMark) [0x000d9] in /Users/builder/jenkins/workspace/build-package-osx-mono/2020-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/resources/manifestbasedresourcegroveler.cs:160
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(150,3): error MSB4018: at System.Resources.ResourceManager.InternalGetResourceSet (System.Globalization.CultureInfo requestedCulture, System.Boolean createIfNotExists, System.Boolean tryParents, System.Threading.StackCrawlMark& stackMark) [0x00099] in /Users/builder/jenkins/workspace/build-package-osx-mono/2020-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/resources/resourcemanager.cs:815
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(150,3): error MSB4018: at System.Resources.ResourceManager.InternalGetResourceSet (System.Globalization.CultureInfo culture, System.Boolean createIfNotExists, System.Boolean tryParents) [0x00002] in /Users/builder/jenkins/workspace/build-package-osx-mono/2020-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/resources/resourcemanager.cs:759
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(150,3): error MSB4018: at System.Resources.ResourceManager.GetString (System.String name, System.Globalization.CultureInfo culture) [0x0005a] in /Users/builder/jenkins/workspace/build-package-osx-mono/2020-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/resources/resourcemanager.cs:1321
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(150,3): error MSB4018: at Xamarin.Bundler.Errors.get_MT1022 () [0x00001] in /Users/poupou/git/master/xamarin-macios/tools/mtouch/errors.Designer.cs:1132
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(150,3): error MSB4018: at Xamarin.Bundler.FileCopier.UpdateDirectory (System.String source, System.String target) [0x00080] in /Users/poupou/git/master/xamarin-macios/tools/common/FileCopier.cs:89
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(150,3): error MSB4018: at Xamarin.MacDev.Tasks.CreateBindingResourcePackageBase.Execute () [0x00091] in /Users/poupou/git/master/xamarin-macios/msbuild/Xamarin.MacDev.Tasks.Core/Tasks/CreateBindingResourcePackageBase.cs:42
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(150,3): error MSB4018: at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () [0x00023] in /Users/builder/jenkins/workspace/build-package-osx-mono-pullrequest/pr/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/TaskExecutionHost/TaskExecutionHost.cs:577
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(150,3): error MSB4018: at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask (Microsoft.Build.BackEnd.ITaskExecutionHost taskExecutionHost, Microsoft.Build.BackEnd.Logging.TaskLoggingContext taskLoggingContext, Microsoft.Build.BackEnd.TaskHost taskHost, Microsoft.Build.BackEnd.ItemBucket bucket, Microsoft.Build.BackEnd.TaskExecutionMode howToExecuteTask) [0x002b9] in /Users/builder/jenkins/workspace/build-package-osx-mono-pullrequest/pr/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/Components/RequestBuilder/TaskBuilder.cs:809
```

There's likely other cases and it's a mistake way too easy to make :(

Maybe we can add a `cecil` test to detect missing ones...