Update loaders to register origin_visit's state
As of today, loaders only creates origin_visit when they finish successfully (through the current
This needs to be updated to:
- create one origin_visit as soon as they start (state: ongoing)
- update the origin_visit's state when done
- successfully (state: full)
- or not (state: partial).
Migrated from T539 (view on Phabricator)