Move clusters app knative to batch counting

ee/changelogs/unreleased/212962-cluster-distinct_by_user-to-move-to-batch-counting-knative.yml

+---
+title: Move Clusters Application Knative to batch counting
+merge_request: 29003
+author:
+type: performance

ee/lib/ee/gitlab/usage_data.rb

@@ -205,7 +205,7 @@ module EE
             clusters_applications_cert_managers: clusters_user_distinct_count(::Clusters::Applications::CertManager, time_period),
             clusters_applications_helm: ::Clusters::Applications::Helm.where(time_period).distinct_by_user,
             clusters_applications_ingress: clusters_user_distinct_count(::Clusters::Applications::Ingress, time_period),
-            clusters_applications_knative: ::Clusters::Applications::Knative.where(time_period).distinct_by_user,
+            clusters_applications_knative: distinct_count(::Clusters::Applications::Knative.where(time_period).available.joins(:cluster), 'clusters.user_id'),
             clusters_disabled: distinct_count(::Clusters::Cluster.disabled.where(time_period), :user_id),
             clusters_enabled: distinct_count(::Clusters::Cluster.enabled.where(time_period), :user_id),
             clusters_platforms_gke: distinct_count(::Clusters::Cluster.gcp_installed.enabled.where(time_period), :user_id),