Helm chart doesn't create Cluster Role for `admin` purposes

[Tyler-2]

This contains the cluster role that gets appended to the admin cluster role: https://github.com/GoogleCloudPlatform/spark-on-k8s-operator/blob/5f2efd4ff97e7c0bfdb726a066118d3401576730/manifest/spark-operator-install/spark-operator-rbac.yaml#L80-L97

But I do not see that this is deployed by the helm chart and there are no options to include it. As a result, admins don't have any permissions to do Spark Operator things.

There does not appear to be any documentation on this either.

[Tyler-2]

This PR added the necessary manifests to the repo but it was never included in the Helm deploy as far as I can tell: https://github.com/GoogleCloudPlatform/spark-on-k8s-operator/pull/473

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