Improved link rel=help to 4 font-loading tests (web-platform-tests#28767

)

Fix

[ci] Send the full release info when updating a manifest release (web…

…-platform-tests#28761)

Since 8268c05 the manifest job has
begun creating untagged-* tags instead of merge_pr_* tags. Example:
https://github.com/web-platform-tests/wpt/runs/2468713699?check_suite_focus=true

The script is still determining the correct tag name and nothing has
changed in WPT, so perhaps the GitHub API has changed. Just send all the
information again to be sure, it's not much harder.

Simplify file-submission.py and the tests using it (web-platform-test…

…s#28758)

This handler was serializing the FieldStorage object in a way that does
not seem useful. It already assumed the "testinput" key of the POST
data, so just properly encode the value and send it back.

Although the tests don't depend on it, this should preserve non-UTF8
input in an escaped form. For example, if testinput were b"\xff", then
the body would end up being:
```html
<script>parent.postMessage("\u00ff", '*');</script>
```

Tests could rely on this if necessary.

Also add missing step_func wrapping.

Follow-up to web-platform-tests#28747 (comment).

WebKit export of https://bugs.webkit.org/show_bug.cgi?id=224594 (web-…

…platform-tests#28751)

Remove most cases of py3-conditional code using PY3 from six (web-pla…

…tform-tests#28747)

Fix the Stash Lock to be unique (web-platform-tests#28741)

Co-authored-by: Antonio Sartori <antoniosartori@google.com>

Refactor xhr/resources/inspect-headers.py to avoid six (web-platform-…

…tests#28740)

This is used by tests in xhr/ and one in html/:
html/webappapis/system-state-and-capabilities/the-navigator-object/navigator.any.js

See also web-platform-tests#28756.

Sync interfaces/ with @webref/idl 2.1.1 (web-platform-tests#28739)

Return early when attempting to focus a remote iframe whose BrowsingC…

…ontext is already the focused one.

Differential Revision: https://phabricator.services.mozilla.com/D112534

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1696323
gecko-commit: 5c4c4c9aa0226b62f00f4b57bce5a86ea53fd560
gecko-reviewers: edgar