[CHORE] Refactor pipeline channel #3235
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The current
PipelineChannelabstraction doesn't work well with streaming sinks, because they can send results from both theexecuteandfinalizemethods, and so it's not able to use theget_next_sendermethod fromPipelineChannel.Instead, it's simpler to have each pipeline node just return a single Receiver, and let the pipeline nodes themselves figure out how to send given the desired ordering.
Depends on #3178