Bug 1600851 [wpt PR 20574] - [Import Maps] Migrate Jest-based resolut…

…ion tests into JSON-based tests, a=testonly

Automatic update from web-platform-tests
[Import Maps] Migrate Jest-based resolution tests into JSON-based tests

This CL

- Defines JSON test object format (see README.md) that describes
  the configurations and specifiers to be tested,
- Implements the WPT test helper for executing the tests
  based on the JSON test objects (common-test-helper.js),
- Converts Jest-based resolution tests into JSONs
  (with some refinement, and removing test cases depending
  on interoperability issues of underlying URL parsers), and
- Removes imported resolution tests.

The dependency to Blink internals remains after this CL.
Removing this dependency is planned and discussed at
WICG/import-maps#170.

Bug: 1026809, WICG/import-maps#170
Change-Id: I993cc9cd7746d7175142f8296ac434571f5d7157
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1927852
Commit-Queue: Hiroshige Hayashizaki <hiroshigechromium.org>
Reviewed-by: Domenic Denicola <domenicchromium.org>
Cr-Commit-Position: refs/heads/master{#721239}

--

wpt-commits: de73fe8cc89c55dea4fee1fc46d98d73dad2b21b
wpt-pr: 20574

UltraBlame original commit: 655a6e51517f24120040773fa1aa41f69532af6c

testing/web-platform/tests/import-maps/common/resolving.tentative.html

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