CherryPicked: [cnv-4.20] [4.21][Storage] Manual Cherry-Pick: Add Velero backup hooks opt-out tests

[cnv-tests-github-webhook-dollierp]

Cherry-pick from cnv-4.21 branch, original PR: #5924, PR owner: ema-aka-young

[openshift-virtualization-qe-bot-5]

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[ema-aka-young]

tox failing - should be closed in favor of #5963