Disable Sidekiq in spec to prevent transient build failures

spec/features/merge_requests/merge_immediately_with_pipeline_spec.rb

@@ -34,11 +34,13 @@ feature 'Merge immediately', :feature, :js do
       page.within '.mr-widget-body' do
         find('.dropdown-toggle').click
-        click_link 'Merge immediately'
-        expect(find('.accept-merge-request.btn-info')).to have_content('Merge in progress')
-        wait_for_ajax
+        Sidekiq::Testing.fake! do
+          click_link 'Merge immediately'
+          expect(find('.accept-merge-request.btn-info')).to have_content('Merge in progress')
+          wait_for_ajax
+        end
       end
     end
   end