Merge branch 'remove-dup-metrics_external_dashboard_url' into 'master'

Remove dup metrics_external_dashboard_url

Closes #11830

See merge request gitlab-org/gitlab-ee!13585

app/helpers/projects_helper.rb

@@ -321,10 +321,6 @@ module ProjectsHelper
     Ability.allowed?(current_user, :admin_project_member, @project)
   end
 
-  def metrics_external_dashboard_url
-    @project.metrics_setting_external_dashboard_url
-  end
-
   def project_can_be_shared?
     !membership_locked? || @project.allowed_to_share_with_group?
   end