lib: predeclare Event.isTrusted prop descriptor

It improves Event creation performance.

PR-URL: #46527
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>

lib/internal/event_target.js

@@ -78,6 +78,13 @@ const isTrusted = ObjectGetOwnPropertyDescriptor({
   }
 }, 'isTrusted').get;
 
+const isTrustedDescriptor = {
+  __proto__: null,
+  configurable: false,
+  enumerable: true,
+  get: isTrusted,
+};
+
 function isEvent(value) {
   return typeof value?.[kType] === 'string';
 }
@@ -113,12 +120,7 @@ class Event {
     }
 
     // isTrusted is special (LegacyUnforgeable)
-    ObjectDefineProperty(this, 'isTrusted', {
-      __proto__: null,
-      get: isTrusted,
-      enumerable: true,
-      configurable: false
-    });
+    ObjectDefineProperty(this, 'isTrusted', isTrustedDescriptor);
     this[kTarget] = null;
     this[kIsBeingDispatched] = false;
   }