pg: Write origin visit updates & status, read from origin_visit_status
That still writes new origin visit and origin visit status but reads from origin visit status.
This partially reverts commit b0b767b9 [1]
This almost realigns the pg storage with other storage implementations (those no longer wrote origin-visit-update since !930 (closed)).
- [1] Related to !930 (closed) Related to T2310
Test Plan
tox
Migrated from D3180 (view on Phabricator)