RFE: kueue-viz: Support ray jobs in workloads view

[akram]

What would you like to be added:
Currently, kueue-viz dashboard and workload views displays workloads and their attached pods. The link between the workload and the pod is determined by using controller-uid label on the pod and make it match with the workload's jobUid label.
See https://github.com/kubernetes-sigs/kueue/blob/release-0.10/cmd/experimental/kueue-viz/backend/handlers/workloads_dashboard.go#L80-L89

For RayJobs it is a bit different causing RayJobs that has not been admitted yet as jobs to no be displayed.
It could be interesting to have a better support of RayJobs or other type of custom integration.

Why is this needed:
User of kueue who uses something else than "standard" jobs may want to have information about their jobs admission.

Completion requirements:
Determine which labels and values have to be reconcilied to display RayJobs in the dashboard view.
Optionally, if a generic way can be implemented for any custom integration, that would be great.

This enhancement requires the following artifacts:

• Design doc
• API change
• Docs update

The artifacts should be linked in subsequent comments.

[mimowo]

/kind dashboard