database: ListIndexableReposOptions can take CloneStatus
Created by: keegancsmith
Instead of a boolean field OnlyUncloned, we can make this take the underlying enum. I intend to use this to only return cloned repos in another call site.
This should not change any behaviour. CloneStatusUnknown is the empty string, which is the default value. That should have the same behaviour as when OnlyUncloned was false (the default value).
Test Plan: CI
plz-review-url: https://plz.review/review/9961