Don't try to stop already stopped environments

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

scripts/review_apps/automated_cleanup.rb

@@ -81,7 +81,7 @@ class AutomatedCleanup
           release = Quality::HelmClient::Release.new(environment.slug, 1, deployed_at.to_s, nil, nil, review_apps_namespace)
           releases_to_delete << release
         end
-      elsif deployed_at < stop_threshold
+      elsif environment.state != 'stopped' && deployed_at < stop_threshold
         stop_environment(environment, deployment)
       else
         print_release_state(subject: 'Review App', release_name: environment.slug, release_date: last_deploy, action: 'leaving')