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Follow up to #41936
Summary
This PR removes the 'NETSDK1219' warning, effectively making UWP .NET 9 support GA. This warning has been added to signal that UWP support for .NET 9 was in preview, as all other components and tooling was also still work in progress (eg. Windows SDK changes for the XAML compiler, Visual Studio support, etc.). Now that all that tooling has shipped in stable (or, will have shipped in stable by the time this PR is published), we can remove this warning and officially mark the feature as GA.
Doing so is also needed to ensure customers on .NET Native can confidently start the migration away from .NET Native.
Customer Impact
No customer impact, this PR is only removing a warning.
Regression?
No.
Testing
Updated unit tests to ensure the new warning is gone.
Risk
Low. This is just removing a target whose sole purpose was to emit a warning.