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

[Julian Schmidt via cfe-commits]

5chmidti wrote:

This feature works as intended, it is only for filtering out diagnosed issues, not for skipping the analysis in those files. See #52959 for the feature you are looking for. TLDR: clang-tidy currently does not skip the analysis in (system) header files, `exclude-header-filter` is only filtering out warnings you are not interested in (i.e., `Supppressed 3386 warnings...`)

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