[clang] [clang] Add covariance tests that make sure we return an error when return value is different in pointer / lvalue ref / rvalue ref (PR #112853)

[Vlad Serebrennikov via cfe-commits]

https://github.com/Endilll commented:

I left suggestions for one of the errors you're expecting. You should apply 
those to the rest of expected directives.

https://github.com/llvm/llvm-project/pull/112853
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