Ensure sendThriftResponse is not called for one-way requests
Ensure sendThriftResponse is not called for one-way requests

Summary: Title. Some custom processors may call `ResponseChannelRequest::sendReply(std::move(buf), cb)` even on oneway requests in order to ensure the callback is executed (e.g., to ensure some cleanup/bookkeeping occurs). This diff simply ensures that the lower level `sendThriftResponse` (which does I/O) is not called on oneway requests for rsocket and rocket transports.

Reviewed By: yfeldblum, spalamarchuk

Differential Revision: D14586589

fbshipit-source-id: 83f15324cad44f4e6e182b602bc7a44755aa14e3

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