[clang-tools-extra] [clang-tidy] Rename `cert-mem57-cpp` to `bugprone-default-operator-new-on-overaligned-type` (PR #165542)

[Baranov Victor via cfe-commits]

https://github.com/vbvictor commented:

Needs small touches on docs (did little proofread) and tests, otherwise LGTM

https://github.com/llvm/llvm-project/pull/165542