Issue #3245996: Move basic exclusions and test coverage into Package Manager

package_manager/src/EventSubscriber/ExcludedPathsSubscriber.php

 <?php
 
-namespace Drupal\automatic_updates\Event;
+namespace Drupal\package_manager\EventSubscriber;
 
 use Drupal\Core\Extension\ModuleExtensionList;
 use Drupal\Core\File\FileSystemInterface;
@@ -11,7 +11,7 @@ use Drupal\package_manager\Event\PreCreateEvent;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
- * Defines an event subscriber to exclude certain paths from update operations.
+ * Defines an event subscriber to exclude certain paths from staging areas.
  */
 class ExcludedPathsSubscriber implements EventSubscriberInterface {