Issue #3383451: Remove PreDestroyEvent and PostDestroyEvent

package_manager/src/Event/PostDestroyEvent.php

-<?php
-
-declare(strict_types = 1);
-
-namespace Drupal\package_manager\Event;
-
-/**
- * Event fired after the stage directory is destroyed.
- *
- * If the stage is being force destroyed, $this->stage may be an object of a
- * different class than the one that originally created the stage directory.
- *
- * @see \Drupal\package_manager\StageBase::destroy()
- */
-final class PostDestroyEvent extends StageEvent {
-}