Replace bootstrap alerts using using Gitlab UI

changelogs/unreleased/233652-replace-bootstrap-alerts-in-ee-app-views-groups-push_rules-edit-ht.yml

+---
+title: Replace bootstrap alerts in ee/app/views/groups/push_rules/edit.html.haml
+merge_request: 41069
+author: Jacopo Beschi @jacopo-beschi
+type: changed

ee/app/views/groups/push_rules/edit.html.haml

@@ -8,7 +8,7 @@
 
 = form_for @push_rule, url: group_push_rules_path(@group), as: :push_rule, method: :put do |f|
   - if @push_rule.errors.any?
-    .alert.alert-danger
+    .gl-alert.gl-alert-danger
       - @push_rule.errors.full_messages.each do |msg|
         %p= msg
   = render "shared/push_rules/form", f: f, context: @group