[Tests] Add unit tests for AbortController and AbortSignal

[gonzaloriestra]

WHY are these changes introduced?

The AbortController and AbortSignal classes in packages/cli-kit/src/public/node/abort.ts are wrapper classes without dedicated unit tests, which leaves a small coverage gap.

WHAT is this pull request doing?

Adds comprehensive unit tests for the abort.ts module in packages/cli-kit/src/public/node/abort.test.ts, checking:

• AbortController and its associated AbortSignal correctly initialize without being aborted.
• Instantiating AbortController and calling abort() correctly updates the aborted status of its corresponding AbortSignal.
• Calling abort(reason) correctly propagates the cancellation reason to the corresponding AbortSignal.

How to test your changes?

CI

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 8501718038938971862 started by @gonzaloriestra

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