Perform scalability and load testing for v1 controller

[merlintang]

trafficstars

• Good reference that summarizes scalability testing for xgboost-operator here
• We may be able to leverage https://github.com/kubeflow/kubebench

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[merlintang]

part of https://github.com/kubeflow/xgboost-operator/issues/44

[XinkaiWang515]

/assign