[Fizz] Expose a method to abort a pending request (#21027)

* Track all suspended work while it's still pending

This allows us to abort work and put everything into client rendered mode
if we don't want to wait for further I/O.

It also allows us to cancel fallbacks if we complete the main content
before the fallback.

* Expose abort API to the browser streams

Since this API already returns a value, we need to use destructuring to
expose more options.

* Add a test including the client actually client rendering it

* Use AbortSignal option for W3C streams instead of external control

* Clean up listener after it's used once