events: return currentTarget when dispatching

PR-URL: https://github.com/nodejs/node/pull/54642
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Mattias Buelens <mattias@buelens.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Ethan Arrowood <ethan@arrowood.dev>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/internal/event_target.js

@@ -196,7 +196,7 @@ class Event {
   get currentTarget() {
     if (!isEvent(this))
       throw new ERR_INVALID_THIS('Event');
-    return this[kTarget];
+    return this[kIsBeingDispatched] ? this[kTarget] : null;
   }
 
   /**