cmd, node, p2p/simulations: fix node account manager leak (#19004)

* node: close AccountsManager in new Close method

* p2p/simulations, p2p/simulations/adapters: handle node close on shutdown

* node: move node ephemeralKeystore cleanup to stop method

* node: call Stop in Node.Close method

* cmd/geth: close node.Node created with makeFullNode in cli commands

* node: close Node instances in tests

* cmd/geth, node: minor code style fixes

* cmd, console, miner, mobile: proper node Close() termination

node/node_example_test.go

@@ -46,6 +46,8 @@ func ExampleService() {
 	if err != nil {
 		log.Fatalf("Failed to create network node: %v", err)
 	}
+	defer stack.Close()
+
 	// Create and register a simple network service. This is done through the definition
 	// of a node.ServiceConstructor that will instantiate a node.Service. The reason for
 	// the factory method approach is to support service restarts without relying on the