Auto merge of #27570 - kunalmohan:gpu-uncaptured-error, r=kvark

Implement GPUUncapturedErrorEvent

<!-- Please describe your changes on the following line: -->
A new `uncapturederror` variant is added to atoms/static-atoms.txt. `GPUUncapturedErrorEvent` is fired when an error is not captured by any `ErrorScope`.
All tests for error scopes `PASS` now.

r?@kvark

---
<!-- 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
- [ ] These changes fix #___ (GitHub issue number if applicable)

<!-- 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. -->

tests/wpt/webgpu/meta/webgpu/cts.html.ini

@@ -137,9 +137,6 @@
 
 
 [cts.html?q=webgpu:api,validation,error_scope:*]
-  [webgpu:api,validation,error_scope:if_no_error_scope_handles_an_error_it_fires_an_uncapturederror_event:]
-    expected: FAIL
-
 
 [cts.html?q=webgpu:api,validation,resource_usages,textureUsageInRender:*]
   expected: CRASH