Merge branch 'qa-sl-nightly-117-stablize-editing-scope-label-spec-ce' into 'master'

CE port of "Stablize editing scope label spec - retry if dropdown is not visible"

See merge request gitlab-org/gitlab-ce!31145

qa/qa/page/project/issue/show.rb

@@ -70,7 +70,10 @@ module QA
           end
           def select_labels_and_refresh(labels)
-            click_element(:edit_link_labels)
+            Support::Retrier.retry_until do
+              click_element(:edit_link_labels)
+              has_element?(:dropdown_menu_labels, text: labels.first)
+            end
             labels.each do |label|
               within_element(:dropdown_menu_labels, text: label) do