Issue #3364958: Stages should be destroyed in the background, during cron runs

package_manager/src/Cleaner.php

@@ -50,7 +50,7 @@ final class Cleaner implements EventSubscriberInterface {
   /**
    * Deletes defunct stage directories during cron runs.
    */
-  public function hookCron(): void {
+  public function deleteDirectories(): void {
     $directories = $this->state->get(static::STATE_KEY, []);
 
     foreach (array_splice($directories, 0, 3) as $dir) {