Added hidden field to permitted update parameters

Allows default cycle analytics stages to be hidden
via a PUT request. Also adds a corresponding test.

ee/app/controllers/analytics/cycle_analytics/stages_controller.rb

@@ -109,7 +109,7 @@ module Analytics
       end
 
       def update_params
-        params.permit(:name, :start_event_identifier, :end_event_identifier, :id, :move_after_id, :move_before_id)
+        params.permit(:name, :start_event_identifier, :end_event_identifier, :id, :move_after_id, :move_before_id, :hidden)
       end
 
       def create_params

ee/spec/controllers/analytics/cycle_analytics/stages_controller_spec.rb

@@ -118,6 +118,20 @@ describe Analytics::CycleAnalytics::StagesController do
         expect(stage.name).to eq(params[:name])
       end
 
+      context 'hidden attribute' do
+        before do
+          params[:hidden] = true
+        end
+
+        it 'updates the hidden attribute' do
+          subject
+
+          stage.reload
+
+          expect(stage.hidden).to eq(true)
+        end
+      end
+
       context 'when positioning parameter is given' do
         before do
           params[:move_before_id] = create(:cycle_analytics_group_stage, parent: group, relative_position: 10).id