tests: get rid of `test_clone`

This clones a remote repo.
https://github.com/iterative/scmrepo/blob/dbfdb6795cfda3451dc0e6e123559637c50c4075/tests/test_scmrepo.py#L11-L18

We should replace this with tests testing:
- [ ] clone with `file://`
- [ ] clone local directory
- [ ] clone with ssh
- [ ] clone with http(s)
- [ ] push_refspec with progress
- [ ] clone with progress
- [ ] fetch_refspec with progress