withPeerSelectionActions - refactorisation

The `withPeerSelectionActions` is quite shallow. We should pull code from `Ouroboros.Network.Diffusion` module to it, so that it's `withPeerSelectionActions` that create the `PeerSelectionAcctions` rather than a callback that does all the work. I think, this can be done so that `getLedgerPeers` callback is not longer passed in a negative position, but rather as a a regular argument.

Start by reading withPeerSelectionActions and Ouroboros.Network.Diffusion, focusing on how PeerSelectionAcctions are currently created and where getLedgerPeers is passed. Trace the callback flow and confirm the refactor's done state: withPeerSelectionActions creates the actions itself and getLedgerPeers is a regular argument rather than a negative-position callback.

Written by the indexing model from the issue text.