feat: allow multiple cluster admin

[hhk7734]

allow multiple cluster admin

/access-management -cluster-admin "<userA>,<userB>"

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[google-oss-prow[bot]]

@andreyvelich: Closed this PR.

In response to this:

The KFAM code has been migrated to the new repo, please re-open PR at: https://github.com/kubeflow/dashboard /close

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