Remove ReplicateObjectDeduplicationNetworkMembership flag and functionality from ReplicateRepository
ReplicateRepository has a flag that can be set to replicate the pool membership of the source project to the target project. It was at some point going to be used for replicating pool memberships with Praefect. It hasn't been used, and won't be used by anything in the foreseeable future. Let's remove the functionality to simplify. It's also not supported by transactions: #6018 (closed).