[whatwg/streams] Add TransformStream test for readable cancel() (#771)

Verify that calling cancel() on the `readable` side cancels the `writable`
side.

The expected reason for the rejection depends on the outcome of #768.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/771

-- Commit Summary --

  * Add TransformStream test for readable cancel()

-- File Changes --

    M reference-implementation/to-upstream-wpts/transform-streams/errors.js (10)

-- Patch Links --

https://github.com/whatwg/streams/pull/771.patch
https://github.com/whatwg/streams/pull/771.diff

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