Show cluster agents UI only when enabled on GitLab.com

No change for self-managed

config/feature_flags/development/cluster_agent_list.yml

----
-name: cluster_agent_list
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/42115
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/249596
-milestone: '13.5'
-type: development
-group: group::configure
-default_enabled: true

ee/app/helpers/ee/clusters_helper.rb

@@ -6,9 +6,13 @@ module EE
 
     override :display_cluster_agents?
     def display_cluster_agents?(clusterable)
-      return unless ::Feature.enabled?(:cluster_agent_list, default_enabled: true)
+      clusterable.is_a?(Project) && clusterable.feature_available?(:cluster_agents) && included_in_gitlab_com_rollout?(clusterable)
+    end
+
+    private
 
-      clusterable.is_a?(Project) && clusterable.feature_available?(:cluster_agents)
+    def included_in_gitlab_com_rollout?(project)
+      ::Gitlab::Kas.included_in_gitlab_com_rollout?(project)
     end
   end
 end

ee/changelogs/unreleased/show_project_kubernetes_agent_on_gitlab_com_state.yml

+---
+title: Hide cluster agent UI if not enabled on GitLab.com
+merge_request: 57668
+author:
+type: changed

ee/spec/helpers/ee/clusters_helper_spec.rb

@@ -16,6 +16,8 @@ RSpec.describe ClustersHelper do
 
     context 'with premium license' do
       before do
+        allow(Gitlab).to receive(:com?).and_return(false)
+
         stub_licensed_features(cluster_agents: true)
       end
 
@@ -33,13 +35,29 @@ RSpec.describe ClustersHelper do
         end
       end
 
-      context 'when cluster_agent_list feature flag is disabled' do
+      context 'GitLab.com' do
         before do
-          stub_feature_flags(cluster_agent_list: false)
+          allow(Gitlab).to receive(:com?).and_return(true)
         end
 
-        it 'does not allows agents to display' do
-          expect(subject).to be_falsey
+        context 'when kubernetes_agent_on_gitlab_com feature flag is disabled' do
+          before do
+            stub_feature_flags(kubernetes_agent_on_gitlab_com: false)
+          end
+
+          it 'does not allows agents to display' do
+            expect(subject).to be_falsey
+          end
+        end
+
+        context 'kubernetes_agent_on_gitlab_com feature flag enabled' do
+          before do
+            stub_feature_flags(kubernetes_agent_on_gitlab_com: clusterable)
+          end
+
+          it 'allows agents to display' do
+            expect(subject).to be_truthy
+          end
         end
       end
     end

lib/gitlab/kas.rb

@@ -27,7 +27,7 @@ module Gitlab
       def included_in_gitlab_com_rollout?(project)
         return true unless ::Gitlab.com?
 
-        Feature.enabled?(:kubernetes_agent_on_gitlab_com, project)
+        Feature.enabled?(:kubernetes_agent_on_gitlab_com, project, default_enabled: :yaml)
       end
     end
   end