[whatwg/dom] AbortSignal's abort reason downstream integration (Issue #1030)

I somehow forgot that `AbortSignal` is a pretty popular API these days. There's more than Fetch and Streams to update. For each impacted specification not only do we need to migrate away from the "aborted flag", we also need to make sure they take into account the object's abort reason, in a matter that is appropriate for the API.

- [ ] https://github.com/whatwg/fetch/pull/1343
- [ ] https://github.com/whatwg/streams/issues/1165 & https://github.com/whatwg/streams/pull/1182
- [ ] https://github.com/w3c/webauthn/issues/1682

@jyasskin where did you notice it?

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