[clang] [clang-tools-extra] Reland [clang][Sema, Lex, Parse] Preprocessor embed in C and C++ (PR #95802)

[Timm Baeder via cfe-commits]

tbaederr wrote:

I just pushed https://github.com/llvm/llvm-project/commit/99f5fcb0d1e04125daa404ff14c9cd14b7a2c40b - I don't have time to run _all_ the tests though, so this is a bit of a long shot. If that doesn't  fix it, then disabling them for now sounds fine to me.

https://github.com/llvm/llvm-project/pull/95802