Removed string literal from labels block selector

app/views/shared/issuable/_sidebar.html.haml

@@ -98,7 +98,7 @@
             = icon('spinner spin', class: 'hidden block-loading', 'aria-hidden': 'true')
             - if can_edit_issuable
               = link_to _('Edit'), '#', class: 'js-sidebar-dropdown-toggle edit-link float-right'
-          .value.issuable-show-labels.dont-hide.hide-collapsed{ class: ("has-labels" if selected_labels.any?) }
+          .value.issuable-show-labels.dont-hide.hide-collapsed.qa-labels-block{ class: ("has-labels" if selected_labels.any?) }
             - if selected_labels.any?
               - selected_labels.each do |label|
                 = link_to_label(label, subject: issuable.project, type: issuable.to_ability_name)

qa/qa/page/merge_request/show.rb

@@ -24,7 +24,7 @@ module QA
         end
         view 'app/views/shared/issuable/_sidebar.html.haml' do
-          element :labels_block, ".issuable-show-labels"
+          element :labels_block
         end
         def fast_forward_possible?
@@ -69,7 +69,7 @@ module QA
         end
         def has_label?(label)
-          page.within('.issuable-show-labels') do
+          page.within(element_selector_css(:labels_block)) do
             element = find('span', text: label)
             !element.nil?
           end