Fix referenceassemblygeneration for .exe files #13963
Merged
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Ref assembly generation is turned on by default by the sdk in dotnet 7.0 rc2 and later. This causes an issue when building .exe files with the --test output enabled.

For example our build displays this output when building on a machine :
The fix is to emit to the reference assembly the entrypoint. This is benign because it will have the correct visibility markings.
In reference assemblies the generated main method looks similar to:
