Add Labels field for harborcluster-minimal storage

[lengrongfu]

• question：When I deploy harbor-operator on the locally built k8s when I create a Harbor Cluster as described in the minimal_stack_fs.yaml file, three pvcs will be created after kubectl apply -f minimal_stack_fs.yaml, but the PVC of harbor-registry does not Create a Labels, resulting in a bound error in the manually created pv.
• Hope：I hope to add an optional Labels field to HarborStorageRegistryPersistentVolumeSpec and HarborStoragePersistentVolumeSpec to associate automatic labels when creating pvc.