[whatwg/fetch] Add `Last-Event-ID` to CORS-safelisted request headers (PR #1788)

Since EventSource implementations in most environments already send this header without CORS preflight request, it makes sense to make it a safe-listed header.

See #568 for more background.

- [ ] At least two implementers are interested (and none opposed):
   * …
   * …
- [x] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * https://github.com/web-platform-tests/wpt/pull/49257
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: …
   * Gecko: …
   * WebKit: …
   * Deno (not for CORS changes): …
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …
- [x] The top of this comment includes a [clear commit message](https://github.com/whatwg/meta/blob/main/COMMITTING.md) to use. 

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


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

  https://github.com/whatwg/fetch/pull/1788

-- Commit Summary --

  * Add `last-event-id` to CORS-safelisted request headers

-- File Changes --

    M fetch.bs (1)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1788.patch
https://github.com/whatwg/fetch/pull/1788.diff

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