Add ClusterAPIMachineManagementVSphere feature gate to vsphere CAPI test

Author: AnnaZivkovic

ci-operator/config/openshift/cluster-api/openshift-cluster-api-master.yaml

@@ -104,6 +104,7 @@ tests:
   steps:
     cluster_profile: vsphere-elastic
     env:
+      FEATURE_GATES: '["ClusterAPIMachineManagementVSphere=true"]'
       FEATURE_SET: TechPreviewNoUpgrade
     test:
     - as: test