staging: Deploy scheduler v0.17

Plan:

• Package swh.scheduler v0.17.0

• Upgrade python3-swh.scheduler on scheduler0.staging

• Migrate db version from 28 to 30 (impacted tables: origin_visit_stats, scheduler_metrics)

• Restart scheduler services [1]

• Ensure the journal client is doing its new job

• [1]

systemctl restart gunicorn-swh-scheduler \
  swh-scheduler-listener.service \
  swh-scheduler-runner.service \
  swh-scheduler-runner-priority.service \
  swh-scheduler-journal-client.service

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Migrated from T3456 (view on Phabricator)