[whatwg/fetch] Add abort reason to abort fetch (PR #1343)

Following on from https://github.com/whatwg/dom/pull/1027, this PR uses the AbortSignal's abort reason in the abort fetch algorithm.

@annevk Does this look okay to you?
/cc @yutakahirano, @domenic 

- [ ] At least two implementers are interested (and none opposed):
   * …
   * …
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * …
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chrome: …
   * Firefox: …
   * Safari: …

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1343


-- Commit Summary --

  * <a href="https://github.com/whatwg/fetch/pull/1343/commits/a18ee76f7e60c75fc952e0fa04f37f5af47153e0">add abort reason to abort fetch</a>

-- File Changes --

    M fetch.bs (20)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1343.patch

https://github.com/whatwg/fetch/pull/1343.diff


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