KEP-3562: [OptimizationJob] Integrate Kueue using `suspend` and `managedBy` fields for queue management

### What you would like to be added?

Context:
Kubeflow Trainer integrates natively with [Kueue](https://kueue.sigs.k8s.io/) for job queuing, quota management, and fair sharing across teams.

Problem:
Without explicit `suspend` and `managedBy` fields on `OptimizationJob`, Kueue cannot gate or queue the top-level optimization parent job or coordinate cluster capacity before spawning trial pods.

Future Goals:

- Add `spec.suspend` and `spec.managedBy` fields to OptimizationJobSpec.

- Update controller reconciliation to respect Kueue's gating controls.

- Ensure trial allocation honors tenant resource quotas.

Relates to KEP-3562 Master Tracking [Issue](https://github.com/kubeflow/trainer/issues/3562).

### Why is this needed?

Proper Kueue integration prevents `OptimizationJob` from over-provisioning cluster resources and ensures fair queue scheduling across multi-tenant clusters.

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