Show GKE cluster callout for project owner as well

app/helpers/callouts_helper.rb

 module CalloutsHelper
   def show_gke_cluster_integration_callout?(kube_feature_name, project)
-    current_user && !user_dismissed?(kube_feature_name) && project.team.master?(current_user)
+    current_user && !user_dismissed?(kube_feature_name) &&
+      (project.team.master?(current_user) ||
+       current_user == project.owner)
   end
 
   private

spec/helpers/callouts_helper_spec.rb

@@ -26,11 +26,21 @@ describe CalloutsHelper do
       end
 
       context 'when user is not master' do
-        before do
-          allow(project).to receive_message_chain(:team, :master?).and_return(false)
+        context 'when the user is owner' do
+          before do
+            allow(project).to receive(:owner).and_return(user)
+          end
+
+          it { is_expected.to be true }
         end
 
-        it { is_expected.to be false }
+        context 'when the user is not owner' do
+          before do
+            allow(project).to receive_message_chain(:team, :master?).and_return(false)
+          end
+
+          it { is_expected.to be false }
+        end
       end
     end