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

mobile/geth.go

@@ -192,6 +192,12 @@ func NewNode(datadir string, config *NodeConfig) (stack *Node, _ error) {
 	return &Node{rawStack}, nil
 }
 
+// Close terminates a running node along with all it's services, tearing internal
+// state doen too. It's not possible to restart a closed node.
+func (n *Node) Close() error {
+	return n.node.Close()
+}
+
 // Start creates a live P2P node and starts running it.
 func (n *Node) Start() error {
 	return n.node.Start()