[w3c/ServiceWorker] Should synthetic responses be validated? (#1571)

In https://github.com/web-platform-tests/wpt/pull/27837#discussion_r588170896 @mfalken suggested that synthetic responses should receive validation similar to network responses. A simple example I can think of would be:
```js
e.respondWith(new Response("...", { headers: [["content-length":"1"],["content-length":"2"]] }))
```
I tend to think this should be fine and we just ignore the `content-length` header as it's pointless for synthetic responses. Am I missing something here?

(I'm going to merge that PR as it matches the specification as written, but I figured I should at least file a follow-up.)

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