[whatwg/streams] Port write() tests to web-platform-tests (#527)

Move tests relating to the WritableStream sink's stream() method to the
testharness.js framework.

To reduce the risk of functional changes, changes to the tests are
intentionally minimal. The only kinds of changes are:

* Use testharness.js syntax
* Match web-platform-tests style
* Use promise_rejects() instead of explicitly checking .then()
* Use assert_equals() instead of if(!equal) fail()
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/527

-- Commit Summary --

  * Port write() tests to web-platform-tests

-- File Changes --

    M reference-implementation/test/writable-stream.js (289)
    A reference-implementation/to-upstream-wpts/writable-streams/write.https.html (12)
    A reference-implementation/to-upstream-wpts/writable-streams/write.js (219)

-- Patch Links --

https://github.com/whatwg/streams/pull/527.patch
https://github.com/whatwg/streams/pull/527.diff

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