GitHub/Bitbucket/etc. importers should provider better feedback about import status
After an importer launches, it's not really clear to the user the progress of the import: whether it failed, whether it's still importing repositories, pull requests, etc.
Ideally, we would be able to show in real-time when the user sees "Importing in progress":
- Progress of the
git fetch
(at the moment, Gitaly silences this, so we have no idea) - % complete of pull requests
- % complete of issues
- % complete of milestones
- Failures, if any