Allow additional Argo admins

[sector2000]

Allow additional Argo admins via gitops.additionalArgoAdmins configuration

Because of dependencies this PR contains also commits from #584

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sector2000
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[openshift-ci]

Hi @sector2000. Thanks for your PR.

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