Arena needs to own its own test infra

[Bobgy]

Google will no longer support Kubeflow common test infra.

Other WGs have migrated to Github Actions and/or an optional test infra supported by AWS: http://bit.ly/kubeflow-test-infra-aws.

/kind process

[Bobgy]

Regardless of the result for #405, we'll turn off Kubeflow common test infra soon.

[Bobgy]

/assign @cheyang @wsxiaozhang @denverdino

[Bobgy]

Nevermind, looks like you are not using it -- this file is empty: https://github.com/kubeflow/arena/blob/master/prow_config.yaml.

I'll remove this presubmit test then.