Remove all load balancers pre-delete

[mnaser]

At the moment, the load balancers are not removed with CAPO.

• Cleanup loadbalancers created by ccm kubernetes-sigs/cluster-api-provider-openstack#842
• [WIP] ✨load balancers: delete orphaned load balancers from same network kubernetes-sigs/cluster-api-provider-openstack#990

We can work-around this by doing something similar to what Magnum does with cleaning up the resources:

https://github.com/openstack/magnum/blob/0ee8abeed0ab90baee98a92cab7c684313bab906/magnum/drivers/heat/driver.py#L306-L311

FTR, pre_delete_cluster is manually called so we can just add it at the top of our delete_cluster. The function that's already implemented seems tied to Heat, so these two parts of code should help:

https://github.com/openstack/magnum/blob/0ee8abeed0ab90baee98a92cab7c684313bab906/magnum/common/octavia.py#L89-L101
https://github.com/openstack/magnum/blob/0ee8abeed0ab90baee98a92cab7c684313bab906/magnum/common/octavia.py#L131-L137

With that in place, we'll be able to wipe all of the resources. However, the one thing to investigate is the cluster UUID in the description and what that is set to with CAPI to make sure the regex works right.

[mnaser]

In order to successfully do this, we'll have to update this part:

https://github.com/vexxhost/magnum-cluster-api/blob/main/magnum_cluster_api/manifests/ccm/openstack-cloud-controller-manager-ds.yaml#L35-L36

we should instead add cluster-name to the config:

https://github.com/kubernetes/cloud-provider-openstack/blob/68f4a3e06cc3823fd8686282aab72b258295f320/pkg/ingress/config/config.go

[mnaser]

https://github.com/openstack/magnum/blob/2a7ab5e9a37565760fb57fb00f5604f1486cdfb1/magnum/drivers/common/templates/kubernetes/fragments/kube-apiserver-to-kubelet-role.sh#L370