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`TransportReplicationAction` is a rather complex beast, and some of its concrete implementations do not need all of its features. More specifically, it (a) chases a primary around the cluster until it manages to pin it down and then (b) executes an action on that primary and all its replicas. There are some actions that are coordinated by the primary itself, meaning that there is no need for the chase-the-primary phases, and in the case of peer recovery retention leases and primary/replica resync it is important to bypass these first phases. This commit is a step towards separating the `TransportReplicationAction` into these two parts. It is a mostly mechanical sequence of steps to remove some abstractions that are no longer in use.