Bug 1657204 [wpt PR 24878] - [WPT] Reland with fix: Test script's base URL used in...

Bug 1657204 [wpt PR 24878] - [WPT] Reland with fix: Test script's base URL used in dynamic imports, a=testonly

Automatic update from web-platform-tests
[WPT] Reland with fix: Test script's base URL used in dynamic imports

This CL checks base URL used in resolving relative URL-like
specifiers in dynamic imports() from

- `<script>`s,
- worker top-level scripts, and
- worker scripts imported by `importScripts()`.

This is for https://github.com/whatwg/html/issues/5751.

This CL relands
https://chromium-review.googlesource.com/c/chromium/src/+/2198835/
with a fix:

`base-url-worker.sub.html` was flaky due to
race between two `fetch_tests_from_worker()`s.
In this reland, a `fetch_tests_from_worker()` is
moved to a new file `base-url-worker-importScripts.html`,
having at most one `fetch_tests_from_worker()` per file.

Bug: 1082086, 1112844
Change-Id: I59c9817a7829e950f40878d376ccb5216207b7e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2337194
Reviewed-by: Domenic Denicola <domenic@chromium.org>
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794865}

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wpt-commits: ad99a9e949c6006cc0f609501de77a0edb1e593a
wpt-pr: 24878