Errors from vault workers are not logged to Sentry

After reporting an error to the vault backend, workers call logging.exception: https://forge.softwareheritage.org/source/swh-vault/browse/master/swh/vault/cookers/base.py$154

and this should be captured by Sentry, but it isn't.

I don't understand why, as vault workers use the same plumbling as loader workers (ie. https://forge.softwareheritage.org/source/swh-scheduler/browse/master/swh/scheduler/celery_backend/config.py$157-167)

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Migrated from T3920 (view on Phabricator)