Remove XamlControlsResourcesV2 rewrite

[MartinZikmund]

GitHub Issue: Closes #22824

PR Type:

🔄 Refactoring (no functional changes, no api changes)

What is the current behavior? 🤔

The XAML source generator in XamlFileGenerator.BuildTypedResourceDictionary() special-cases XamlControlsResources and rewrites it to XamlControlsResourcesV2 in generated C#:

if (type.GetFullyQualifiedTypeExcludingGlobal().Equals("Microsoft.UI.Xaml.Controls.XamlControlsResources", ...))
{
    // Generates: new global::Microsoft.UI.Xaml.Controls.XamlControlsResourcesV2()
}

This was needed when V1/V2 coexisted. V1 is gone; XamlControlsResources already forces Version2 and initializes both FluentTheme and FluentTheme.v2 static resources.

What is the new behavior? 🚀

• The special-case rewrite is removed. XamlControlsResources references in XAML now generate new XamlControlsResources() like any other typed ResourceDictionary subclass.
• XamlControlsResourcesV2 is kept as-is for backward compatibility with existing C# references.

PR Checklist ✅

Please check if your PR fulfills the following requirements:

• 📝 Commits must be following the Conventional Commits specification.
• 🧪 Added Runtime tests, UI tests, or a manual test sample for the changes have been added (for bug fixes / features) (if applicable)
• 📚 Docs have been added/updated which fit documentation template (for bug fixes / features)
• 🖼️ Validated PR Screenshots Compare Test Run results.
• ❗ Contains NO breaking changes

Other information ℹ️

No functional change — XamlControlsResources constructor already calls Uno.UI.FluentTheme.v2.GlobalStaticResources.Initialize() / RegisterDefaultStyles() / RegisterResourceDictionariesBySource() in its UpdateSource() path, identical to what XamlControlsResourcesV2 does.

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Pull request overview

This PR removes a legacy special-case in the XAML source generator that rewrote Microsoft.UI.Xaml.Controls.XamlControlsResources to XamlControlsResourcesV2, aligning generated code with the actual type referenced in XAML now that V1 is no longer supported.

Changes:

• Removed the XamlControlsResources -> XamlControlsResourcesV2 rewrite in XamlFileGenerator.BuildTypedResourceDictionary().
• Added a generator test covering typed XamlControlsResources usage in a merged dictionary.
• Updated/added expected generated output snapshots for the new test case.

Reviewed changes

Copilot reviewed 2 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/SourceGenerators/Uno.UI.SourceGenerators/XamlGenerator/XamlFileGenerator.cs	Drops the hard-coded rewrite and always emits new <typed ResourceDictionary>() for typed dictionaries.
src/SourceGenerators/Uno.UI.SourceGenerators.Tests/XamlCodeGeneratorTests/Given_ResourceDictionary.cs	Adds a regression test ensuring XamlControlsResources is instantiated (not rewritten).
src/SourceGenerators/Uno.UI.SourceGenerators.Tests/XamlCodeGeneratorTests/Out/Given_ResourceDictionary/WhTyXaCoReReDi/XamlCodeGenerator_MyResourceDictionary_92716e07ff456818f6d4125e055d4d57.cs	Snapshot: verifies emitted new global::Microsoft.UI.Xaml.Controls.XamlControlsResources() in merged dictionaries.
src/SourceGenerators/Uno.UI.SourceGenerators.Tests/XamlCodeGeneratorTests/Out/Given_ResourceDictionary/WhTyXaCoReReDi/XamlCodeGenerator_GlobalStaticResources.cs	Snapshot: expected generated GlobalStaticResources for the new test case.
src/SourceGenerators/Uno.UI.SourceGenerators.Tests/XamlCodeGeneratorTests/Out/Given_ResourceDictionary/WhTyXaCoReReDi/XamlCodeGenerator_LocalizationResources.cs	Snapshot: expected localization metadata output for the new test case.

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