Fixed missing source file assets on some samples

[Arlodotexe]

This PR fixes an issue where the .xaml and .cs source files were failing to load in-app for some samples.

Related #18

[Arlodotexe]

This has been tested on UWP and Wasm. Wasdk still needs testing, I ran into issues getting it to launch on my machine.

[michael-hawker]

That fixed the Headered control ones, but the behaviors are still broken:

Probably because they're in a sub-directory for organization:

(Same with the ConstrainedBox samples.)

Suppose we should just flatten them for now? 😟 Would be nice to support folders for samples as Behaviors, Primitives, the Extensions are all larger projects.

Is there a better way we can think to test and validate this setup moving forward too?

[Arlodotexe]

I guess we just flatten them for now? There's not many options in terms of finding the subfolder path of a xaml or cs file.

[michael-hawker]

Had a thought during lunch and came to a realization why this folderpath was there.

There's a couple of issues with different causes:

1. The Headered control samples are using HeaderedContentControlExperiment.Samples namespace, but it should be HeaderedControlsExperiment.Samples instead as we trim the assembly name from the path here:

   Tooling-Windows-Submodule/CommunityToolkit.App.Shared/Renderers/ToolkitSampleRenderer.xaml.cs

   Line 267 in b8e7235

   var folderPath = typeNamespace.Replace(simpleAssemblyName, "").Trim('.').Replace('.', '/');

   Since they don't match, that was causing these ones not to load.

2. Since we use the namespace as an identifier and replace . with / above...

   Tooling-Windows-Submodule/CommunityToolkit.App.Shared/Renderers/ToolkitSampleRenderer.xaml.cs

   Line 255 in b8e7235

   var typeNamespace = type.Namespace;

   If the Behaviors and the ConstrainedBox samples in theirs sub-folders added the folder name to the namespace (as VS usually tries to do) instead of being in a flattened root namespace, then it should be able to properly load the samples (assuming our SG doesn't care about namespace...)

Going to test this out now by adjusting the namespaces of these three sets of samples.

[michael-hawker]

Fixed in CommunityToolkit/Windows#214 now! 🎉🎉🎉

No tooling changes required, going to close this.