Deploy swh.model 4.1.0 / swh.storage 0.41.0 to staging

Deploy the latest version of swh.model and swh.storage to staging.

• make sure all new packages are available (swh.model, swh.storage, swh.deposit)
• run the first half of the database migration, adding new fields
• stop all workers
• upgrade and restart gunicorn-swh-storage instances (storage1, webapp)
• upgrade and restart worker0
• check that new revisions and releases are getting the new offset fields populated
• restart all other workers
• run the data migration for the new fields on old objects
• add database constraints for all objects once the migration has run

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Migrated from T3818 (view on Phabricator)