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: https://github.com/nodejs/node/pull/35496

PR-URL: https://github.com/nodejs/node/pull/36002


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