Prune unused WinUI locale resources

[Marc-André Moreau (mamoreau-devolutions)]

Summary

• Remove non-en-us WinUI XAML framework .mui satellite resources from the publish file list
• Keep the en-us neutral fallback files
• Leave self-contained deployment and ReadyToRun unchanged

Validation

• Reviewed the initial GLM 5.2 implementation and found it did not affect the release zip path
• Updated the MSBuild target to prune ResolvedFileToPublish after ComputeFilesToPublish and before CopyFilesToPublishDirectory
• Ran Release x64 publish with RuntimeIdentifier=win-x64; publish output contains only:
  • en-us/Microsoft.ui.xaml.dll.mui
  • en-us/Microsoft.UI.Xaml.Phone.dll.mui
• Recreated the release zip staging path; zip contains only those 2 .mui files
• Integrity tree refresh succeeded for the slimmed unigetui_bin output

Size impact

• Removes 170 .mui files (~3.37 MB uncompressed)
• Release zip measured at 88.75 MB after pruning