New endpoint to get current deployment object

Acceptance criteria:

• There is a new endpoint in the backend:
  • GET /device/deployments/{id}/update_control_map
  • No parameters.
• If the deployment is in progress:
  • In Open Source: Return empty JSON object
  • In Enterprise: Return the update_control_map of that device deployment (only the object).
• If deployment is not found or aborted, return 404 Not found.
• Endpoint is available in both Open Source and the Enterprise only, with the behavior above.