Merge branch '233662-replace-bootstrap-alerts' into 'master'

Replace bootstrap alerts

Closes #233662

See merge request gitlab-org/gitlab!41874

ee/app/views/groups/dependency_proxies/show.html.haml

@@ -23,5 +23,6 @@
     - if @dependency_proxy.enabled
       = render 'groups/dependency_proxies/url'
 - else
-  .alert.alert-info
+  .gl-alert.gl-alert-info
+    = sprite_icon('information-o', size: 16, css_class: 'gl-icon gl-alert-icon gl-alert-icon-no-title')
     = _('Dependency proxy feature is limited to public groups for now.')