[whatwg/fetch] Use "body with type" from #1392 throughout spec (Issue #1410)

Currently `(safely) extract a body` returns a mime type and a body. #1392 introduces a new tuple type for the combo of these two types. We should switch to using it for the `extract a body` return type and other relevant fields after #1392 lands.

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Received on Thursday, 10 March 2022 12:40:26 UTC