Cluster `distinct_by_user` to move to batch counting

The following distinct_by_user cluster counters should be refactored the batch counting.

    203:            clusters_applications_cert_managers: ::Clusters::Applications::CertManager.where(time_period).distinct_by_user,
    204:            clusters_applications_helm: ::Clusters::Applications::Helm.where(time_period).distinct_by_user,
    205:            clusters_applications_ingress: ::Clusters::Applications::Ingress.where(time_period).distinct_by_user,
    206:            clusters_applications_knative: ::Clusters::Applications::Knative.where(time_period).distinct_by_user,
    254:            clusters_applications_prometheus: ::Clusters::Applications::Prometheus.where(time_period).distinct_by_user,
    312:            clusters_applications_runner: ::Clusters::Applications::Runner.where(time_period).distinct_by_user,