Add web_url method on epic index page

qa/qa/ee/page/group/epic/index.rb

@@ -32,6 +32,13 @@ module QA
               all_elements(:epic_title_text).first.click
               page.validate_elements_present! if page
             end
+
+            # This is a workaround to get the URL of the first epic
+            # since this attribute is not exposed by the API.
+            # See https://gitlab.com/gitlab-org/gitlab-ee/issues/11241.
+            def web_url
+              page.all('.qa-epic-title-text a').first[:href]
+            end
           end
         end
       end