[BUG] Roslyn 4.0 Source Code Generator Does Not Load

@sharwell

Describe the bug
This is in reference to this PR:
#1216

After installing 6.1.11-preview and attempting to load in Visual Studio 2022 4.1, the source code generator does not load as expected:

I have traced it to the following condition found on this line:

AND '$(LangVersion)' == 'preview'

If I remove this condition, the next problem is presented.

It appears that there is an issue with *.dll. This doesn't work:

<Analyzer Include="$(MSBuildThisFileDirectory)../../build/analyzers/cs/roslyn40/*.dll" />

But this does:

<Analyzer Include="$(MSBuildThisFileDirectory)../../build/analyzers/cs/roslyn40/InterfaceStubGeneratorV2.dll" />

Steps To Reproduce

And upgrade this project to 6.1.11-preview.

You can see on this line that LangVersion is set to preview, so this should work, but doesn't.

Expected behavior
The Source Generator loads and all is happy. :)

Screenshots

NA/above.

Environment

Additional context

I would submit a PR but I am unsure why the LangVersion doesn't work. Better to have @sharwell take another crack at this. :)

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