[w3c/ServiceWorker] Interaction of fetch abort with Cache APIs (#1286)

What error should be returned from put() and add() if the fetch is aborted using AbortSignal?

In other words, what should code like this log?

```javascript
  const controller = new AbortController();
  const signal = controller.signal;
  const request = new Request('slow', { signal });
  const response = await fetch(request);
  const cachePromise = cache.put(request, response);
  controller.abort();
  try {
    await cachePromise;
    console.log('unwanted success');
  } catch (e) {
    console.log(e);
  }
```

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