Re: [w3c/ServiceWorker] Check for Run Service Worker failure and disallow starting redundant workers. (#1419)

Hi Jake, I made a couple changes since last time:
- For postMessage, moved getting incumbentSettings and serializing (which possibly rethrows the exception) out of the parallel steps, since I don't think you can do those in parallel.
- Backported to v1 which needed some work since the "callbackSteps" part of Run Service Worker which this replaces was never in v1 to begin with.

I don't see how to compile v1 so I'm not sure it works, but looking at https://www.w3.org/TR/service-workers-1 it hasn't been built since 2017 (?).

I'll go ahead and merge this but if you see something wrong we can fix it.


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