[clang-tools-extra] [clang-tidy] `isOnlyUsedAsConst`: Handle static method calls. (PR #84005)

[Clement Courbet via cfe-commits]

legrosbuffle wrote:

> LGTM, verify if some release notes shouldn't be updated.

This is very minor, I've only seen a few instances in the Google codebase, but it was trivial enough to include.

https://github.com/llvm/llvm-project/pull/84005