EE: Remove un-used overrides

The CE methods have been removed as they were un-used

ee/app/models/concerns/ee/deployment_platform.rb

@@ -14,29 +14,6 @@ module EE
         .first&.platform_kubernetes
     end
 
-    override :find_cluster_platform_kubernetes
-    def find_cluster_platform_kubernetes(environment: nil)
-      return super unless environment && feature_available?(:multiple_clusters)
-
-      clusters.enabled
-        .on_environment(environment)
-        .last&.platform_kubernetes
-    end
-
-    override :find_group_cluster_platform_kubernetes
-    def find_group_cluster_platform_kubernetes(environment: nil)
-      return super unless environment && feature_available?(:multiple_clusters)
-
-      # With relevant_only: true
-      # on_environment use CASE which returns numbers in ascending order
-      # So we can use `hierarchy_order: :asc` + first
-      ::Clusters::Cluster
-        .enabled
-        .on_environment(environment, relevant_only: true)
-        .ancestor_clusters_for_clusterable(self, hierarchy_order: :asc)
-        .first&.platform_kubernetes
-    end
-
     override :find_instance_cluster_platform_kubernetes
     def find_instance_cluster_platform_kubernetes(environment: nil)
       return super unless environment && feature_available?(:multiple_clusters)