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This patches bazel_clang_tidy handling of headers. I found an equivalent change at https://github.com/erenon/bazel_clang_tidy/pull/13, but that was [already rejected](https://github.com/erenon/bazel_clang_tidy/pull/13#issuecomment-1047007424). Per the criticism, this will result in redundant processing of headers. The project instead uses `HeaderFilterRegex: ".*"`, but that results in two problems: 1. When running with `-k`, errors are repeated when a header is included more than once, which is common. 2. clang-tidy including errors from headers that are included from other modules (e.g., abseil-cpp); filtering correctly is difficult. Given the trade-offs and options (including forking), I thought patching was preferable so long as it remains narrow.
Toolchain
A design is currently maintained in Google Drive. It'll be migrated to markdown once we are confident in its stability.