fix: Prevent error event after connect timeout

When the initial connection to the database timed out, an `error` event was erronously emitted on the connection, and a socket instance was leaked and never released.

src/connection.js

@@ -690,6 +690,11 @@ class Connection extends EventEmitter {
         return this.socketError(err);
       }
 
+      if (this.state === this.STATE.FINAL) {
+        socket.destroy();
+        return;
+      }
+
       this.socket = socket;
       this.socket.on('error', this.socketError);
       this.socket.on('close', this.socketClose);