Can be tested on development branch

Fixed in Branch Name: 2174-VariablesDebugOutputToTab due to feedback on WOLF-2193 Dev being in the same area to fix.

Fix
Removed the loop that finds the item, and instead just removed the item selected.

Added tests to validate this

Branch Name: 2124-ServiceNotExist

Steps to reproduce:

1. Create new workflow
2. Drag on SqlServer tool
3. Select existing database
4. Change Tab
5. Disconnect server
6. Change back to original tab
7. Notice Service does not exist error

FIX:
Added a check to the QueryManagerProxy class to validate if the server is still connected. If not, a Server Disconnected message will show and return. Added this fix to every fetch method in that class, to make sure that all the methods are validated before continuing.

Validate by:

1. Follow steps to reproduce
2. Notice popup message occurs
3. Then reconnect the server
4. Swap tabs back to original tab to be tested
5. Notice that the lists are there again.