Re: [whatwg/fetch] Add chunk type checking of requestForServiceWorker's body's stream (#1199)

Tentative commit message:
```
Check chunk type of body's stream when passed to a service worker

Tests: https://github.com/web-platform-tests/wpt/pull/28203
```

@yoichio it's not clear to me how this fixes #267 as we still don't use BYOB streams, right? It sounds like that only matters for responses so doesn't block upload streams, but it's still something that needs to be done?

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