bug: Helm chart deployment for the Kueue Kubestellar integration uses hard coded image tag

[cwiklik]

Describe the bug

The Kueue Kubestellar deployment fails to launch due to a missing image. The problem is that helm chart deployment (operator.yaml) uses hard coded image tag.

Steps To Reproduce

Pull galaxy project from Git.
Go to scripts/kueue and run install-all.sh
Do: kubectl get pods -A
Notice a pod with name like kueue-ks-controller-manager-bd955f845-xxxxx is not running.
Inspect the deployment and notice this error: Back-off pulling image "ko.local/kueue-ks:e559205"

Expected Behavior

Kueue-KS deployment should start without errors. Need to remove hardcoded tag and use placeholder instead.

Additional Context

No response

[pdettori]

addressed by #26