[clang-tools-extra] [clang-tidy] add depercation warning for non-whitelisted global options (PR #121057)

[Carlos Galvez via cfe-commits]

carlosgalvezp wrote:

Looks good in general. I wonder however how it will work for people who are stuck in old clang-tidy files for whatever reason - this warning can be very noisy if running clang-tidy in CI with lots of files. Do we need some CLI option to allow users to silence the warnings?

https://github.com/llvm/llvm-project/pull/121057