Revert "[clang-format][NFC] Delete 100+ redundant #include lines in .cpp files"

This reverts commit b92d6dd704d789240685a336ad8b25a9f381b4cc. See
github.com/llvm/llvm-project/commit/b92d6dd704d7#commitcomment-139992444

We should use a tool like Visual Studio to clean up the headers.

NOKEYCHECK=True
GitOrigin-RevId: b2082a98175b0e5356f23bf21d3dc5b76edea390
1 file changed