Fix issue in WPF scenarios where our source generator was getting ran twice #1731
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When the Windows SDK projection package and the CsWinRT package is referenced, the same source generator from both packages get included. But .NET has logic as part of
ResolveAssemblyReferencesto determine the newer one and only use that. But for some reason this logic wasn't getting triggered in WPF scenarios. Given this issue only occurs when the CsWinRT package is referenced, making use of our targets to ensureResolveAssemblyReferenceshas ran by the timeCoreCompileruns to ensure the deduplication has happened.