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

F2F: My comment above is wrong. The double microtask is intentional. The use of the dispatch flag is intentional and catches an edge case with multiple event listeners:

```js
addEventListener('fetch', event => {
  event.waitUntil(Promise.resolve());
});

addEventListener('fetch', event => {
  // This should work, and it's the dispatch flag that makes it work.
  event.waitUntil(whatever());
});
```

Action: Write web platform tests for this.

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