Auto merge of #25755 - pshaughn:insertqueue, r=nox

Use CE reaction queue when inserting an element from non-fragment parser

<!-- Please describe your changes on the following line: -->
Changed async_html Tokenizer so it can remember whether it's for a fragment and changed servoparser node insertion to respect the CE queue requirements of https://html.spec.whatwg.org/multipage/parsing.html#insert-a-foreign-element; it passes a WPT test.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #25746

<!-- Either: -->
- [X] There are tests for these changes

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

0 files changed, 0 insertions, 0 deletions