OCPBUGS-36233: Replicas hook consider Control plane topology

[dfajmon]

If ControlPlaneTopology is set to HighlyAvailable return pod count 2 else 1.

backporting from #1796

[openshift-ci-robot]

@dfajmon: This pull request references Jira Issue OCPBUGS-36233, which is invalid:

• expected the bug to target either version "4.17." or "openshift-4.17.", but it targets "4.18.0" instead
• expected the bug to be in one of the following states: NEW, ASSIGNED, POST, but it is ON_QA instead
• expected Jira Issue OCPBUGS-36233 to depend on a bug targeting a version in 4.18.0 and in one of the following states: MODIFIED, ON_QA, VERIFIED, but no dependents were found

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

If ControlPlaneTopology is set to HighlyAvailable return pod count 2 else 1.

backporting from #1796

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

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