Description of problem:

Custom CPMS name fails on OpenStack. This was caught by the CI jobs:

https://prow.ci.openshift.org/view/gs/test-platform-results/logs/periodic-ci-openshift-cluster-control-plane-machine-set-operator-release-4.19-periodics-e2e-openstack-techpreview/1877591758888505344

Notes:

• The job that exercices that test is the TechPreview one
• We need to confirm that the test runs fine on other platforms
• The feature was introduced here: https://github.com/openshift/cluster-control-plane-machine-set-operator/pull/332 and the periodic tests: https://github.com/openshift/cluster-control-plane-machine-set-operator/pull/338