Auto merge of #25697 - pshaughn:supportedentrytypes, r=jdm

PerformanceObserver.supportedEntryTypes

<!-- Please describe your changes on the following line: -->
It felt odd to cache these directly in GlobalScope, but they need to be [SameObject] and the global scope is where the spec implies they go.

---
<!-- 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 #25587

<!-- 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