The functionality was all moved to the Controls container, these containers are no longer used

Fixes issue #3269

Expand on the backdrop integration test to make sure this is documented/tested behavior

Add cloud provider APIs for deleting and renaming cloud variables. Remove dataIndex from writeToServer function since it is not used.

Set VM's cloud provider to null when disconnecting from the cloud server. Add unit test for disconnecting on unmount.

This will work better if there are other query string options that need to be handled later. It also handles the distinction between ‘all’ and the other tutorials better.