[clang-tools-extra] [clang-tidy] bugprone-assert-side-effect non-const operator methods (PR #71974)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL approved this pull request.

Code is fine and can be merged, unless you want it merged as "schenker at users.noreply.github.com" you may need to disable email privacy options or try to squash all commits in one.

https://github.com/llvm/llvm-project/pull/71974