Formalize logging

In addition to that change, I think it makes sense to log (in DEBUG level) that a rate limit 429 has occurred, but IDK how the maintainers would like to add logging here, if at all. If anyone agrees with me on this I'd love to have guidance on how to add this logging.

_Originally posted by @bachsh in https://github.com/python-gitlab/python-gitlab/issues/2074#issuecomment-1159817354_