[clang-tools-extra] [clang-tidy] Add a release note about unchecked-optional-access smart pointer caching (PR #122290)

[via cfe-commits]

https://github.com/EugeneZelenko commented:

Could you please also move `readability-identifier-naming` entry before `readability-implicit-bool-conversion` and place `:program:run-clang-tidy.py` entry after `:program:clang-tidy.py`?

https://github.com/llvm/llvm-project/pull/122290