Simplify InboundPipeline and make it more obviously correct #91350
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Extracted as the hopefully not so controversial change from #80656 which does not alter the ref counting but saves complexity and cycles.
The intermediary fragments list is redundant as it duplicates tracking of fragments in the inbound aggregator. By passing fragments directly down the pipeline instead of putting them into the list we can avoid having to check for end of message in the inbound pipeline entirely.
Also, the logic becomes more obviously safe and correct since we save the unintuitive step of releasing the fragments list in a final loop.