Quarantine a test in spec/features/issues/issue_detail_spec.rb

Signed-off-by: Rémy Coutable <remy@rymai.me>

spec/features/issues/issue_detail_spec.rb

@@ -28,7 +28,7 @@ describe 'Issue Detail', :js do
       visit project_issue_path(project, issue)
     end
 
-    it 'encodes the description to prevent xss issues' do
+    it 'encodes the description to prevent xss issues', quarantine: 'https://gitlab.com/gitlab-org/gitlab/issues/207951' do
       page.within('.issuable-details .detail-page-description') do
         image = find('img.js-lazy-loaded')