feat(nbstore): remove async on connection api (#9187)

We should not use async on `connect` and `disconnect`, for `WebSocketConnection` will never connect when offline.

We should handle the connection status of each storage in sync, using the `connection.waitForConnect`

This PR also puts the connection reference count on the `connect` and disconnect`

packages/common/nbstore/src/impls/cloud/socket.ts

@@ -184,7 +184,7 @@ export class SocketConnection extends Connection<Socket> {
     return conn;
   }
 
-  override async doDisconnect(conn: Socket) {
+  override doDisconnect(conn: Socket) {
     conn.close();
   }