Request for support streaming RPC data receive failure handling

The `StreamInputHandler` on_received_messages function has return value, but no one will handle the return value. I think it is better to make it possible for handling the failure

Start by locating StreamInputHandler::on_received_messages and tracing its return value through the streaming RPC receive path. Determine how receive failures should be surfaced or handled, then add coverage showing that the failure is observable and handled as intended.

Written by the indexing model from the issue text.