Remove cowboy_req:transport/1

It was added to help with response body streaming functions.
But it was a clumsy solution that we discarded in favor of
passing socket and transport to said function. It was also
very odd compared to the rest of the cowboy_req interface.

If you used this function before, worry not, here's its
proper equivalent.

[Socket, Transport] = cowboy_req:get([socket, transport], Req)

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