svn.loader: Let core loader update snapshot & visit at the same time
Prior to this commit, the loader svn did an origin visit update to set the snapshot. And then the loader core did the update to set the status.
This removes the origin visit update on the snapshot to let the loader core do everything.
Related to swh-loader-core!356 (closed)
Test Plan
tox
Migrated from D2888 (view on Phabricator)