Goal: 

As a follow up of [1], the goal of this story is to complete the pattern by distributing the ValidateTopology logic  [0] across the nova-operator API instances.

[0] https://github.com/openstack-k8s-operators/infra-operator/pull/356

[1] https://github.com/openstack-k8s-operators/nova-operator/pull/924

[2] https://github.com/openstack-k8s-operators/nova-operator/pull/924/files#r1969740248
[3] https://github.com/openstack-k8s-operators/nova-operator/pull/924/files#r1969721501

[4] https://github.com/openstack-k8s-operators/nova-operator/pull/924/files#r1969728737