Remove `Symbol.dispose` integration in `setTimeout` and `setInterval`

As part of the [Symbol.dispose] integration, the Timeout return type of setTimeout and setInterval support disposing (https://github.com/nodejs/node/pull/48633). This was stabilized last week (https://github.com/nodejs/node/pull/58467).

I think this integration should be removed, as the web platform setTimeout / setInterval do not support Symbol.dispose and never can, because it returns a number.

This means that folks may start writing new code that is incompatible between browser and Node, just because they use the Symbol.dispose integration here. That would be unfortunate.

It would also cause one more incompatibility between server side platforms with web setTimeout, and Node setTimeout (e.g Cloudflare Workers) (cc @jasnell).

@mcollina said in person that this was made stable recently enough to still remove it.

Beginne mit der Überprüfung der setTimeout- und setInterval-Einstiegspunkte und der verknüpften Änderungen in den PRs 48633 und 58467. Bestätige, wie Timeout derzeit Symbol.dispose bereitstellt, und ermittle die Kompatibilitätserwartungen für Browser-Timer; abgeschlossen ist die Aufgabe, wenn diese Integration entfernt wurde und das bestehende Timer-Verhalten erhalten bleibt.