[whatwg/fetch] Block redirects to non-HTTP schemes (#309)

Note that HTML's navigate is probably a special case still with its manual redirect logic (see https://github.com/whatwg/html/issues/461) although Firefox appears quite strict there as well (not supporting mailto or facetime URLs, which appear to work in other browsers).

(One difference I've found is that Firefox supports data URLs in `Location` headers when navigating, but not otherwise. That is also the case for Safari. Chrome never supports data URLs.)

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