[clang] [Sema] Fix c23 not checking CheckBoolLikeConversion (PR #79588)

[Pil Eghoff via cfe-commits]

pileghoff wrote:

For testing i have fixed the new warnings in `n3042.c` and i have expanded `warn-int-in-bool-context.c` to check c23 specefically (which was broken, but is now fixed) and i added a few extra cases to the test. I will take a look at the release notes later today.

https://github.com/llvm/llvm-project/pull/79588