[clang-tools-extra] [clang-tidy][NFC] Enable `readability-container-contains` check in clang-tidy config and apply fix-its (PR #157123)

[Nicolas van Kempen via cfe-commits]

nicovank wrote:

If I wasn't clear, yes I completely agree 👍. Ship it. Just commented for reference.

https://github.com/llvm/llvm-project/pull/157123