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)
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)