Cleanup transformers-cli
Note to maintainers:
- the `ListReposObjsCommand` (using `HfApi.list_repos_objs`) (which has been deprecated for a while) is going to be removed server-side soon (cc @coyotte508 @XciD @Pierrci) so we should also remove them from transformers now IMO
- the other stuff is just removing deprecation errors (no actual functionality is removed) so I'd advocate to also remove it now. (no need to wait for a major version IMHO)

Related PR: https://github.com/huggingface/huggingface_hub/pull/702
_The documentation is not available anymore as the PR was closed or merged._