Codechange: [Network] split CloseSocket and CloseConnection more clearly (#9261)

* Codechange: [Network] split CloseSocket and CloseConnection more clearly

- CloseSocket now closes the actual OS socket.
- CloseConnection frees up the resources to just before CloseSocket.
- dtors call CloseSocket / CloseConnection where needed.

src/network/core/tcp_admin.h

@@ -482,7 +482,6 @@ public:
 	NetworkRecvStatus CloseConnection(bool error = true) override;
 
 	NetworkAdminSocketHandler(SOCKET s);
-	~NetworkAdminSocketHandler();
 
 	NetworkRecvStatus ReceivePackets();