[clang] [clang][AST] Add unit test for lambda not marked dependent in `noexcept` specifier (PR #232986)

[Balázs Benics via cfe-commits]

https://github.com/steakhal commented:

@AaronBallman Could you dispatch this test to someone knowledgable about Sema? - not urgent
We believe that this CXXRecordDecl should be regarded as a depentent context - because it depends on the deduced auto.

This affects how we should fix the crash in the checker.

https://github.com/llvm/llvm-project/pull/232986