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.

Inizia esaminando i punti di ingresso di setTimeout e setInterval e le modifiche collegate nelle PR 48633 e 58467. Conferma come Timeout espone attualmente Symbol.dispose e identifica le aspettative di compatibilità per i timer del browser; il lavoro è completato quando questa integrazione viene rimossa preservando il comportamento esistente dei timer.