Disable init container injection for ray

[fraenkel]

When istio is enabled, the kuberay-operator must disable the init container injection.

See https://docs.ray.io/en/latest/cluster/kubernetes/k8s-ecosystem/istio.html#step-3-optional-enable-istio-mtls-strict-mode

Pull Request Template for Kubeflow manifests Issues

✏️ A brief description of the changes

The kubeflow overlay will disable the init container injection.

📦 List any dependencies that are required for this change

#2907

✅ Contributor checklist

• Make sure you have tested with kustomize. See Installation Prerequisites
• All the commits have been signed-off (To pass the DCO check)

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[google-oss-prow]

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