Disable Sidekiq in spec to prevent transient build failures

spec/features/merge_requests/merge_immediately_with_pipeline_spec.rb

@@ -34,6 +34,7 @@ feature 'Merge immediately', :feature, :js do
       page.within '.mr-widget-body' do
         find('.dropdown-toggle').click
 
+        Sidekiq::Testing.fake! do
           click_link 'Merge immediately'
 
           expect(find('.accept-merge-request.btn-info')).to have_content('Merge in progress')
@@ -42,4 +43,5 @@ feature 'Merge immediately', :feature, :js do
         end
       end
     end
+  end
 end