Add wiki total/synced/failed to prometheus metrics
In https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3560 we added wiki total, synced and failed to the GeoNodeStatus
object, but completely forgot to add them to the prometheus metrics
They should be added here: https://gitlab.com/gitlab-org/gitlab-ee/blob/master/ee/app/models/geo_node_status.rb#L10
/cc @jameslopez @jramsay (I've given this %10.4 for now, as it seems bad that this is missing)