Archive counters are no longer updated in production

Since the 2020-11-25 the object counters are not computed. It impacts :

• the production counters

• at least the "Objects added by time period" grafana dashboard [1]

• [1] https://grafana.softwareheritage.org/d/BAQISLkGk/objects-added-by-time-period?orgId=1&var-environment=production&var-interval=1d&var-object_type=All

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Migrated from T2828 (view on Phabricator)