[w3c/ServiceWorker] Recovering from start failures (#1503)

Currently when a service worker fails to start, the result is a network error. A service worker failing to start can happen due to a bad script or other non-transient errors, so it would be more useful for the user to have a fallback that bypasses the service worker in this case.

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https://github.com/w3c/ServiceWorker/issues/1503