Postgres backend: rename raw_extrinsic_metadata.id to target
Consistently with swh.model v0.7.2
Test Plan
tox + applied the db upgrade and checked that the databases were identical
Migrated from D4395 (view on Phabricator)
Staging instance, all changes can be removed at any time
Consistently with swh.model v0.7.2
tox + applied the db upgrade and checked that the databases were identical
Migrated from D4395 (view on Phabricator)