[w3c/ServiceWorker] cache.addAll() is not consistent in aborting outstanding requests on error (#1543)

In the cache.addAll() algorithm:

https://w3c.github.io/ServiceWorker/#cache-addAll

The spec periodically cancels outstanding requests with text like:

```
Terminate all the ongoing fetches initiated by requests with the aborted flag set.
```

However, it does not appear to do this if the fetch() rejects instead of resolving a promise.  It also does not do this if a resolved Response has ok() return false, status code is 206, etc.

Also, does this kind of termination cause the associated `Request.signal` to expose the abort status?  I'm having a hard time understanding that from the spec.  @jakearchibald do you know?

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