Bug 1656828 [wpt PR 24850] - [WPT] Migrate some worker.onerror tests to WPT, a=testonly

Bug 1656828 [wpt PR 24850] - [WPT] Migrate some worker.onerror tests to WPT, a=testonly

Automatic update from web-platform-tests
[WPT] Migrate some worker.onerror tests to WPT

This CL

- Adds a worker.addEventListener() case in
  /wpt/workers/interfaces/WorkerGlobalScope/onerror/not-handled.html
  to migrate worker-onerror-03.html.
- Removes some other
  third_party/blink/web_tests/fast/workers/worker-onerror-*
  tests already covered by WPTs, and
- Removes flaky TestExpectations for
  third_party/blink/web_tests/fast/workers/worker-onerror-*
  that look no longer flaky.

Bug: 1050039, 795636
Change-Id: Ia309e69acf3fe083c947533b0b2961fc1096d3ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2332090
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794028}

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wpt-commits: e02f0bd2d6a427f879ea59621401a58943d9ba5a
wpt-pr: 24850