[clang-tools-extra] Add option to exclude headers from clang-tidy analysis (PR #91400)

[Nick Desaulniers via cfe-commits]

nickdesaulniers wrote:

> Sadly no, this does not exist yet and the linked issue is for tracking that feature.

@5chmidti #52959 is marked closed and the commit that closed it doesn't look related.

https://github.com/llvm/llvm-project/pull/91400