Revert SiteStatistic change in GPRD Sidekiq nodes
Geo Prometheus metrics are off (e.g. by 25,000 Wikis) due to errors in the SiteStatistic
calculation. We reverted the use of these counters in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/6793, but since RC3 was not deployed today we did not pick up this change.
The failover relies on the metrics to be accurate, so I'm going to apply this patch only to the Sidekiq besteffort nodes on GRPD to keep the scope as limited as possible.