the unit cluster on workload-cluster shouldn't depend on metal3

in values.yaml the cluster unit depends on metal3 if infra_provider is set to capm3. We shouldn't have this dependency for workload-cluster.

It generates the following error in a capm workload-cluster deployment:

Helm install failed: execution error at (sylva-units/templates/units.yaml:199:18): unit 'cluster' is declared with a dependency on disabled unit 'metal3'

We should update the unit cluster dependency in workload-cluster.values.yaml to add a depends_on false to metal3 unit