Add spec for pipeline_details_entity_spec

spec/serializers/pipeline_details_entity_spec.rb

@@ -29,7 +29,7 @@ describe PipelineDetailsEntity do
         expect(subject[:details])
           .to include :duration, :finished_at
         expect(subject[:details])
-          .to include :stages, :artifacts, :manual_actions
+          .to include :stages, :artifacts, :manual_actions, :scheduled_actions
         expect(subject[:details][:status]).to include :icon, :favicon, :text, :label
       end