[clang] [Clang][Sema] Disable checking invalid template id in initializer of primary variable template `std::format_kind` with libstdc++ (PR #139560)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

Can you please describe the issue in the summary instead of just saying it fixes .... Also add details such as this is fixing an issue introduced by ... 

Also please as Erich asked, add a test too

https://github.com/llvm/llvm-project/pull/139560