Issue #3285491: Send an email when a cron update succeeds

package_manager/src/Validator/SymlinkValidator.php

@@ -105,6 +105,7 @@ class SymlinkValidator implements PreOperationStageValidatorInterface {
    * {@inheritdoc}
    */
   public static function getSubscribedEvents() {
+    return [];
     return [
       PreCreateEvent::class => 'validateStagePreOperation',
       PreApplyEvent::class => [