Re: [w3c/ServiceWorker] Improve handling of extend lifetime promises (#1049)

Note that I didn't remove the [extend lifetime promises](https://w3c.github.io/ServiceWorker/#extendableevent-extend-lifetime-promises) definition. I presume we might want to check if we can rely solely on the pending promises count definition replacing the extend lifetime promises. But I'm not entirely sure yet. The extend lifetime promises is being referenced by other specs to run their own custom callbacks (e.g. https://wicg.github.io/BackgroundSync/spec/#fire-a-sync-event). Examining the extend lifetime promises also allows checking whether the extendable event succeeded or failed depending on the contexts.

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