[whatwg/fetch] Passthrough original error response unless there's a security issue in doing so (#352)

https://fetch.spec.whatwg.org/#http-fetch 3.3 currently creates a generic network error. This means browsers display a generic error message if a navigation fails.

Ideally the browser should be able to display more relevant information like "bad certificate", "DNS failure", "You are offline", which I guess involves passing the error response back to the caller (navigation in this case).

@annevk suggests there are cases where this is a security issue, so a TODO is to find out what these are & when we can safely pass the error on.

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