fix: register Symfony EventDispatcher outside of MVC tests

Author: Nattfarinn

eZ/Publish/Core/settings/events.yml

@@ -6,3 +6,7 @@ services:
 
     eZ\Publish\Core\Repository\EventSubscriber\:
         resource: '../Repository/EventSubscriber/*'
+
+    Symfony\Component\EventDispatcher\EventDispatcher: ~
+    Symfony\Component\EventDispatcher\EventDispatcherInterface: '@Symfony\Component\EventDispatcher\EventDispatcher'
+    event_dispatcher: '@Symfony\Component\EventDispatcher\EventDispatcherInterface'