the example that made me think of this is https://github.com/mongodb/mongo/blob/c9cdc22691d53870264c7491d899d82cc02ac56c/src/mongo/s/query/planner/cluster_aggregation_planner.cpp#L767 like if we pass it the pipeline this seems like something that could just be a helper on the pipeline and liteParsed pipeline class.

if it cannot be implemented like that maybe it could be part of a common sharded agg planning state object, it seems like we are doing a lot of prop drilling in this code and this is one example where we could get rid of an arg alltogether