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

swarm/network/simulation/kademlia_test.go

@@ -33,7 +33,6 @@ func TestWaitTillHealthy(t *testing.T) {
 		"bzz": func(ctx *adapters.ServiceContext, b *sync.Map) (node.Service, func(), error) {
 			addr := network.NewAddr(ctx.Config.Node())
 			hp := network.NewHiveParams()
-			hp.Discovery = false
 			config := &network.BzzConfig{
 				OverlayAddr:  addr.Over(),
 				UnderlayAddr: addr.Under(),