Re: [slightlyoff/ServiceWorker] Does accessing ExtendableEvent's extend lifetime promises race? (#931)

F2F:

* `Set <var>extendLifetimePromises</var> to a copy of` happening before parallel doesn't seem to be an issue, since it's only ever going to be more promises, which we want to catch
* We need to look at the spec language for "waiting for all" to see if it queues a microtask

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