[clang-tools-extra] [clang-tidy] new check misc-use-internal-linkage (PR #90830)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL commented:

Few nits.

Missing:
- more proper handling for unity files (.cpp included from .cpp)
- nits
- auto-fixes (any) - in worst case you can provide just fixes with static, but attaching them to notes.

https://github.com/llvm/llvm-project/pull/90830