Re: [whatwg/streams] Allow aborting an ongoing pipe operation using AbortSignals (#744)

I noticed a couple more issues while writing tests:
* It doesn't work if the AbortSignal is already signalled when pipeTo() is called.
* What happens when there are other shutdown conditions is not defined; eg. calling `rs.pipeTo(ws, { signal })` where `rs` is already closed and `signal` is already signalled.

If we figure out the answer to the second question then I can solve the first.

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