Bug 1859344 [wpt PR 42563] - Add XML test for setHTMLUnsafe/parseHTML…

…Unsafe, a=testonly

Automatic update from web-platform-tests
Add XML test for setHTMLUnsafe/parseHTMLUnsafe

This was recommended here:
https://chromium-review.googlesource.com/c/chromium/src/+/4824679/3..8/third_party/blink/web_tests/external/wpt/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/setHTMLUnsafe.html#b6

Bug: 1478969
Change-Id: Ic2a6ef62d2b1affde4cadc8cf131b60cb57af33a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4942972
Commit-Queue: Joey Arhar <jarharchromium.org>
Reviewed-by: David Baron <dbaronchromium.org>
Cr-Commit-Position: refs/heads/main{#1229667}

--

wpt-commits: 113b3dc05a9f4b3c4c5497a549320f3928c6bfa5
wpt-pr: 42563

UltraBlame original commit: 59921b0032a35e9621aa1f8cc994699cf6891571