[whatwg/fetch] Only break for 101 in "websocket" mode (PR #1491)

Also document how we should refactor this in the future.

Tests: https://wpt.fyi/fetch/security/1xx-response.any.html.


Fixes #1397.

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(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/1491


-- Commit Summary --

  * Only break for 101 in "websocket" mode

-- File Changes --

    M fetch.bs (7)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1491.patch

https://github.com/whatwg/fetch/pull/1491.diff


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