feat(openstack-cloud-controller-manager): add splitMode

[cwrau]

What this PR does / why we need it:

This allows the user to deploy the controller-manager split between the
management cluster and the workload cluster.

That way the cluster is not dependent "on itself".

Special notes for reviewers:

The management mode only deploys the controller and the workload mode only
deploys the necessary RBAC roles and bindings.

Release note:

[openstack-cloud-controller-manager] Allow deploying the controller-manager split between management and workload clusters.

[k8s-ci-robot]

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[k8s-ci-robot]

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[cwrau]

This has shown itself to be useful when theres trouble with the nodes resulting in dozens or hundreds of NotReady nodes which in turn break other stuff like cilium, as their pods get scheduled there and will never run.

And the ccm can't clean those nodes up, as it doesn't run yet.

With this one can run the ccm outside the cluster which makes sure that it always works™️

[cwrau]

Ok, I thought I had to bump the chart version as I had to for #3067, but that also didn't help and I don't know how I would fix that dependency issue