tests: get rid of `test_clone`

[skshetry]

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