Allow to batch disconnect on folder level

[Current behavior]
In Connections panel, the folder level "Disconnect" sub menu does not work, it's always disabled, even when all connections on the folder is active.

The workaround to batch close all connections is to close the panel.

[Expected behavior]
Disconnect sub menu on folder level should work in same ways as Connect sub menu, that means when Disconnect sub menu clicked, all connections under that folder should be disconnected and the tab also need be closed.

Further more, when do batch connect/disconnect on a folder, if the connection is already activated, it's better to reuse the current connection instead of create a new connection, just same as Royal TS behavior currently.

Thanks.