swarm: snapshot load improvement (#18220)

* swarm/network: Hive - do not notify peer if discovery is disabled

* p2p/simulations: validate all connections on loading a snapshot

* p2p/simulations: track all connections in on snapshot loading

* p2p/simulations: add snapshotLoadTimeout variable

* p2p/simulations: ignore control events in snapshot load

* p2p/simulations: simplify event loop synchronization

* p2p/simulations: return already connected error from Load function

* p2p/simulations: log warning on snapshot loading disconnection