test: use global.EventTarget instead of internals

`EventTarget` is exposed on the global scope, there is no need to use
`--expose-internals` flag in the tests.

Refs: #35496

PR-URL: #36002
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

test/parallel/test-abortcontroller.js

@@ -1,10 +1,9 @@
-// Flags: --no-warnings --expose-internals
+// Flags: --no-warnings
 'use strict';
 
 const common = require('../common');
 
 const { ok, strictEqual } = require('assert');
-const { Event } = require('internal/event_target');
 
 {
   // Tests that abort is fired with the correct event type on AbortControllers

test/parallel/test-eventtarget-once-twice.js

@@ -1,10 +1,5 @@
-// Flags: --expose-internals --no-warnings
 'use strict';
 const common = require('../common');
-const {
-  Event,
-  EventTarget,
-} = require('internal/event_target');
 const { once } = require('events');
 
 const et = new EventTarget();

test/parallel/test-eventtarget-whatwg-once.js

@@ -1,13 +1,7 @@
-// Flags: --expose-internals --no-warnings
 'use strict';
 
 const common = require('../common');
 
-const {
-  Event,
-  EventTarget,
-} = require('internal/event_target');
-
 const {
   strictEqual,
 } = require('assert');

test/parallel/test-eventtarget.js

@@ -2,11 +2,7 @@
 'use strict';
 
 const common = require('../common');
-const {
-  Event,
-  EventTarget,
-  defineEventHandler
-} = require('internal/event_target');
+const { defineEventHandler } = require('internal/event_target');
 
 const {
   ok,

test/parallel/test-nodeeventtarget.js

@@ -2,10 +2,7 @@
 'use strict';
 
 const common = require('../common');
-const {
-  Event,
-  NodeEventTarget,
-} = require('internal/event_target');
+const { NodeEventTarget } = require('internal/event_target');
 
 const {
   deepStrictEqual,