GraphQL repositories: allow TotalCount for cloned/uncloned/cloneStatus

Created by: mrnugget

Since we now have gitserver_repos table and can do this with a join, I don't see a big reason for why we can't do this, especially since we already allow it for failedFetch.

This addresses parts of https://github.com/sourcegraph/sourcegraph/issues/39980

Test plan

• Existing and new tests