db: Deprecate the repo.cloned column
Created by: ryanslade
We will be relying on gitserver_repos.clone_status instead.
This change moves us in that direction by:
- Removing the cloned field from type.Repo
- Falling back to read from repo.cloned ONLY when there is no corresponding row in gitserver_repos.
In the next release we will delete the repos.cloned column.