Reinstate new merge request pipelines hash in API

app/controllers/projects/merge_requests_controller.rb

@@ -245,9 +245,10 @@ def new
       format.json do
         define_pipelines_vars
 
-        render json: PipelineSerializer
+        render json: {
+          pipelines: PipelineSerializer
           .new(project: @project, user: @current_user)
-          .represent(@pipelines)
+          .represent(@pipelines) }
       end
     end
   end

spec/controllers/projects/merge_requests_controller_spec.rb

@@ -43,7 +43,8 @@
           submit_new_merge_request(format: :json)
 
           expect(response).to be_ok
-          expect(json_response).not_to be_empty
+          expect(json_response).to have_key 'pipelines'
+          expect(json_response['pipelines']).not_to be_empty
         end
       end
     end