feat: add ctrl+c cancellation on running pw-checks/tests

[ferrandiaz]

Affected Components

• CLI
• Create CLI
• Test
• Docs
• Examples
• Other

Notes for the Reviewer

Adds a --detach (-d) flag to the test, pw-test, and trigger commands. When active, Ctrl+C no longer exits immediately — instead it shows a confirmation prompt and cancels the remote test session via POST /v1/cancel, allowing the server to return results marked as cancelled rather than dropping the connection mid-run.

SIGINT flow (with --detach)

• First Ctrl+C: pauses the check queue, shows "Stop running checks?" prompt
• Confirm: emits a CANCEL event, resumes the queue, server returns results with cancelled status
• Decline: resumes the queue; the next Ctrl+C will ask again
• Second Ctrl+C while the prompt is active: force-quits with exit code 130
• Without --detach: Ctrl+C exits immediately (behavior unchanged)

Key files changed

• rest/cancel.ts — new file, thin client for POST /v1/cancel
• abstract-check-runner.ts — SIGINT handler added as private methods; cleanup in finally
• Reporter files — CANCELLED status handling, isCancelled priority
• test, pw-test, trigger command files — flag declaration and cancel handler wiring

[github-actions]

🎉 Experimental release successfully published on npm

npm install checkly@0.0.0-pr.1292.7946d5d