Remove code that won't be used anymore

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

@@ -32,13 +32,6 @@ 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_of_first_epic
-              page.all('.qa-epic-title-text a').first[:href]
-            end
           end
         end
       end