Remove query editor routes

Query editor depends on route configuration to work correctly.
e.g. `/query/servers/server_0` is the route for the SQL connection to `server_0`.
The route is introduced in order to open the query editor via a quick link on the cluster detail control page. However, this is over necessary, there is another way to do a similar job.

When clicking the button to open the query editor for a specific server, it can just find the worksheet having a connection to that server and make it an active worksheet. This gets rid of the need for using routes for the query editor.