[13.x] Introduce WorkerInterrupted event

[jackbayliss]

When a signal arrives from infra, the worker finishes the current job before stopping cleanly so we rely on the WorkerStopping event.

But, a worker is not guaranteed to finish a job before it's killed from infra.

So, my idea of a WorkerInterrupted event is born!

This is basically nice from an observability view.

This complements the Interruptible job stuff, essentially. IE I want to know my workers are being signaled, but the jobs may not need to care. I can then log, call Slack etc when a signal arrives so its no longer guess work

Open to renaming it to WorkerSignaled or something if you prefer :)

No test cause its signals.. but can do a fake test if you want?

I've just done it inline, same as WorkerStopping rather than making an executeX method

I think I've done it in a non-bc way, but also:

So forgive me!

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