[clang-tools-extra] added option `google-readability-namespace-comments.AllowNoNamespaceComments` (PR #124265)

[Baranov Victor via cfe-commits]

vbvictor wrote:

Please add entry in ReleaseNotes.rst (should be in alphabetical order by check name) and fix carlosgalvezp's final comment. After that should be ready for merge

https://github.com/llvm/llvm-project/pull/124265