What does this PR do?

This PR fixes the workspace startup process to prevent the Dashboard from overwriting the DevWorkspace Operator Config attribute every time the workspace starts.

What issues does this PR fix or reference?

fixes eclipse-che/che#22573

Is it tested? How?

1. Create a DWOC object in your workspaces namespace:

   apiVersion: controller.devfile.io/v1alpha1
   kind: DevWorkspaceOperatorConfig
   metadata:
     name: custom-dwoc
     namespace: <your-namespace>
   config:
     workspace:
       persistUserHome:
         enabled: true

2. Reference the DWOC from a devfile:

   schemaVersion: 2.2.0
   metadata:
     name: my-app
   + attributes:
   +   controller.devfile.io/devworkspace-config:
   +     name: custom-dwoc
   +     namespace: <your-namespace>
   components:

3. Create the workspace and verify it has a correct reference to the DWOC specified:

   $ kubectl get dw -o json | jq '.items[0].spec.template.attributes."controller.devfile.io/devworkspace-config"'
   {
     "name": "custom-dwoc",
     "namespace": "<your-namespace>"
   }