[whatwg/fetch] Allow streaming requests to follow 301/2 redirects if method is 'POST' (#1058)

If I'm reading the spec correctly, we return an error if the body is a stream (it has no source) and we get a redirect that isn't 303 https://fetch.spec.whatwg.org/#concept-http-redirect-fetch (step 9).

It seems like we could allow 301/2 redirects if the method is POST, since the body is discarded (step 11).

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