[clang-tools-extra] [clang-tidy] Improve "-quiet" option by suppressing "xxx warnings generated" (PR #154012)

[Carlos Galvez via cfe-commits]

https://github.com/carlosgalvezp approved this pull request.

LGTM, thanks for fixing!

It might be worth double-checking the comment I wrote about this carets option (which I guess is equivalent to passing the command line flag):

https://github.com/llvm/llvm-project/issues/47042#issuecomment-1305630120

In particular the fact that part of the diagnostic is removed. But perhaps it's only for compiler warnings and it's not a problem for clang-tidy.

https://github.com/llvm/llvm-project/pull/154012