Add AbortSignal.any() IDL entry and corresponding tests

[vardhan30016]

Summary

This PR adds the missing AbortSignal.any() static method to the Web IDL definitions
and introduces basic tests to verify correct behavior according to the specification.

Changes

• Updated interfaces/dom.idl to include:
  static AbortSignal any(sequence<AbortSignal> signals);
• Added new test file: dom/abort/abort-signal-any.any.js
• Tests verify:
  • AbortSignal.any() returns a new AbortSignal
  • Combined signal aborts when any input signal aborts
  • TypeError is thrown when invalid items are passed

Why

The AbortSignal.any() method exists in the spec and in browser implementations,
but the Web Platform Tests repo did not yet include IDL coverage or functional tests.
This PR brings WPT closer to spec completeness.

Notes

• Tests are minimal and follow the existing WPT style.
• Happy to adjust file location or test structure if maintainers suggest improvements.

[vercel]

@vardhan30016 is attempting to deploy a commit to the freemanjiang's projects Team on Vercel.

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[vardhan30016]

Hi @freeman-jiang 👋

Just following up on this PR — please let me know if any changes are needed.
The Vercel deploy check fails only because I’m not part of the team, but the code and tests
themselves are clean and merge-ready.

Happy to update anything you’d like. Thanks for maintaining this project!