Get the onboarding script.

Get the onboarding script that can be used to onboard the cluster.

The returned script can be run in the terminal to onboard the cluster to Phase 2.
The installation contains the core Phase 2 components as well as the AI Optimizer Proxy component.
The script is idempotent and can be run multiple times to update the existing components.
The script will automatically discover all the cluster properties required for onboarding.