Use simplified Git fields to create worker versions in ALTO/METS import commands

https://redmine.teklia.com/issues/5720

The arkindex_cli.commands.upload.db.get_or_create_worker_version helper, used by the ALTO and METS import commands, relies on the worker_version.revision.hash and worker_version.revision.commit_url returned by RetrieveWorkerRun. Those are being removed in backend#1805 (closed), and the fields added in backend#1775 (closed) should be used instead.