Fixing codegen source - LatestVersion should be Experimental

[George Gao (gegao18)]

Fixes

The codegen source Microsoft.UI.Xaml.cs is using the wrong WinUIContract value in its attributes. It should be WinUIContract.Experimental and not WinUIContract.LatestVersion.

Fixes #

PR Type

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Description

The codegen source Microsoft.UI.Xaml.cs has the wrong attribute value on the experimental DataTemplate ctors. It should be WinUIContract.Experimental (used in main) and not WinUIContract.LatestVersion (used in release/... branches).

I also noticed some whitespace diffs when running codegen locally, so I'm checkin in the updated generated .idl.

Current Behavior

LatestVersion is the enum value used in release branches. main's equivalent is Experimental.

New Behavior

Same as before, but we're using the correct one now.

Customer Impact

N/A - this is codegen. The generated idl is already correct, but the source was wrong.

Regression Potential

• Low risk — isolated change, limited scope
• Medium risk — touches shared components or public APIs
• High risk — architectural or breaking API change

How Has This Been Tested?

• I have performed a self-review of my own code - runcodegen.cmd now passes.
• I have added tests to cover my changes
• Existing tests pass locally

Screenshots (if appropriate)

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