Cherry-pick: Fix kubevirt_virt_operator_ready test flakiness (PR #2155)

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🍒 Automated Cherry-pick from PR

This PR contains the cherry-pick of PR #2155 from OhadRevah/openshift-virtualization-tests.

Original PR: Fix kubevirt_virt_operator_ready test flakiness
Author: @OhadRevah
Merge Commit: c7f9253

The cherry-pick was applied cleanly to cnv-4.99 without conflicts.

Original PR Link: #2155
Original Commit: c7f9253

Original PR Description

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:

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-69870

Summary by CodeRabbit

• Tests
  • Improved stability of observability tests by verifying operator replicas reach the desired count before assertions, reducing intermittent failures.
  • Standardized replica count handling post-verification to ensure non-empty values and align with expected test inputs.
  • Results in more deterministic CI runs and clearer failure signals when replica states are unmet, aiding faster triage.

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D/S test tox -e verify-bugs-are-open failed: cnv-tests-tox-executor/17209