Remove unused "alerts moved" callout from frontend

app/assets/javascripts/persistent_user_callouts.js

@@ -5,7 +5,6 @@ const PERSISTENT_USER_CALLOUTS = [
   '.js-users-over-license-callout',
   '.js-admin-licensed-user-count-threshold',
   '.js-buy-pipeline-minutes-notification-callout',
-  '.js-alerts-moved-alert',
   '.js-token-expiry-callout',
 ];
 

app/views/projects/services/alerts/_top.html.haml

 .row
   .col-lg-12
-    .gl-alert.gl-alert-info.js-alerts-moved-alert{ role: 'alert' }
+    .gl-alert.gl-alert-info{ role: 'alert' }
       = sprite_icon('information-o', size: 16, css_class: 'gl-icon gl-alert-icon gl-alert-icon-no-title')
       .gl-alert-body
         = _('You can now manage alert endpoint configuration in the Alerts section on the Operations settings page. Fields on this page have been deprecated.')

app/views/projects/services/prometheus/_top.html.haml

@@ -2,7 +2,7 @@
 
 .row
   .col-lg-12
-    .gl-alert.gl-alert-info.js-alerts-moved-alert{ role: 'alert' }
+    .gl-alert.gl-alert-info{ role: 'alert' }
       = sprite_icon('information-o', size: 16, css_class: 'gl-icon gl-alert-icon gl-alert-icon-no-title')
       .gl-alert-body
         = s_('AlertSettings|You can now set up alert endpoints for manually configured Prometheus instances in the Alerts section on the Operations settings page. Alert endpoint fields on this page have been deprecated.')