[whatwg/streams] Use promise_test in ported transform-stream.js tests (#763)

Replace uses of async_test in tests that were ported to the web-platform-tests
framework with promise_test. Use flushAsyncEvents() rather than timeouts.
Change descriptions to "should" style.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/763

-- Commit Summary --

  * Use promise_test in ported transform-stream.js tests

-- File Changes --

    M reference-implementation/to-upstream-wpts/transform-streams/errors.https.html (2)
    M reference-implementation/to-upstream-wpts/transform-streams/errors.js (92)
    M reference-implementation/to-upstream-wpts/transform-streams/general.js (36)

-- Patch Links --

https://github.com/whatwg/streams/pull/763.patch
https://github.com/whatwg/streams/pull/763.diff

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