[6.0][concurrency] Update withUnsafe{,Throwing}Continuation to have a sending result. #74163
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Explanation: This PR updates withUnsafe{,Throwing}Continuation to have a sending result and for the whole UnsafeContinuation to have the same API surface in terms of sending that withChecked{,Throwing}Continuation has.
Radars:
Original PRs:
Risk: Low. These are all alwaysEmitIntoClient so there is no ABI impact.
Testing: Added tests to the test suite.
Reviewer: N/A