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Do not reference unloaded snapshots in origin_visit_update

Nicolas Dandrimont requested to merge generated-differential-D3201-source into generated-differential-D3201-target

When a repository fails to load, and the visit is set to partial status, some loaders might have been able to generate a snapshot and an identifier, but without actually loading it to the archive. This generates partial visits referencing an inexistant snapshot.

Make sure that we only reference a snapshot in origin_visit_update when it's actually been loaded (and flushed) to storage; do so by turning the get_snapshot_id method into a loaded_snapshot attribute that gets populated explicitly after flushing the snapshot to storage.

Depends on !90 (closed). Depends on !91 (closed).

Test Plan

new tox tests added for the new behavior

Migrated from D3201 (view on Phabricator)

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