Validate that .resx files aren't included as bundled resources in WinAppSDK platform

Related to: https://github.com/xamarin/xamarin-macios/issues/14442

We need to check how .resx files are handled in packaging for Windows platform in MAUI.

iOS and Android will handle these changes.

We should exclude `@EmbeddedResources` and `@Compile` item groups from our single project resources

Start by tracing how the Windows platform packages single-project resources and handles the @EmbeddedResources and @Compile item groups. Compare the behavior with the related xamarin-macios issue, then verify that .resx files are excluded from bundled resources while other platform resource handling remains unchanged.

Written by the indexing model from the issue text.