CherryPicked: [cnv-4.18] Fix kubevirt_virt_operator_ready test flakiness

[OhadRevah]

Short description:

The test failing at the setup once in a while,
this happen because None passed as expected value
when not needed, added validation that virt_operator has replicas before proceeding.

More details:

Original PR: #2155

What this PR does / why we need it:

Which issue(s) this PR fixes:

Special notes for reviewer:

jira-ticket:

https://issues.redhat.com/browse/CNV-69873

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[rnetser]

/approve
/lgtm

@OhadRevah in the future, please use /cehrry-pick <branch> mechanism for such PRs

[dshchedr]

/lgtm

[OhadRevah]

/verified

[hmeir]

/lgtm

[rnetser]

/approve
/lgtm

[openshift-virtualization-qe-bot-2]

New container for quay.io/openshift-cnv/openshift-virtualization-tests:cnv-4.18 published