[whatwg/streams] Use multi-global tests (#967)

* Update `wpt-runner` to version 2.7.0, which adds support for running multi-global `*.any.js` tests (domenic/wpt-runner#12)
* Update to the newly refactored tests from web-platform-tests/wpt#14172
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/967

-- Commit Summary --

  * Update to wpt-runner 2.7.0
  * Roll WPT

-- File Changes --

    M reference-implementation/package.json (2)
    M reference-implementation/web-platform-tests (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/967.patch
https://github.com/whatwg/streams/pull/967.diff

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