Re: [w3c/ServiceWorker] async waitUntil microtask issue (#1213)

Ohhh I may be wrong about this. All the above tests in my last comment actually should not throw.

The reason is the [microtask checkpoint](https://html.spec.whatwg.org/multipage/webappapis.html#perform-a-microtask-checkpoint) at the end of the event dispatcher does not finish until there are no queued microtasks. So in these test cases, the event dispatch flag keeps the event active even though pending promise count reaches 0 at some points.

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