Add end-to-end smoke tests for the CsWinRT NuGet package - #2456

Add end-to-end smoke tests for the CsWinRT NuGet package#2456

Sergio Pedri (Sergio0694) merged 42 commits into

staging/winrt-runtime-ref-assemblymicrosoft/CsWinRT:staging/winrt-runtime-ref-assemblyfrom

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