Add in-tree volume plugin tags to CSI provisioned volumes

[ialidzhikov]

/area storage
/kind bug
/priority normal
/platform aws

This PR configures the csi-provisioner and aws-ebs-csi-driver to add in-tree volume plugin tags to volumes to keep the backwards-compatibility. See kubernetes-sigs/aws-ebs-csi-driver#530

Currently a volume provisioned with the in-tree volume plugin has the following tags:

KubernetesCluster                        shoot--foo--bar1     
Name                                     shoot--foo--bar1-dynamic-pvc-a78c281f-78d5-46cd-8849-3fc2bd04ab28     
kubernetes.io/cluster/shoot--foo--bar1   owned     
kubernetes.io/created-for/pv/name        pvc-a78c281f-78d5-46cd-8849-3fc2bd04ab28     
kubernetes.io/created-for/pvc/name       pvc-name
kubernetes.io/created-for/pvc/namespace  default

Currently (before this PR) a volume provisioned with CSI has the following tags:

CSIVolumeName                             pv-shoot--foo--bar2-40e919e4-95f2-4808-8539-a4d0547b4aff     

After this PR a new volume provisioned with CSI has the following tags:

CSIVolumeName                             pv-shoot--foo--bar2-40e919e4-95f2-4808-8539-a4d0547b4aff     
Name                                      shoot--foo--bar2-dynamic-pv-shoot--foo--bar2-40e919e4-95f2-4808-8539-a4d0547b4aff
kubernetes.io/cluster/shoot--foo--bar2    owned
kubernetes.io/created-for/pv/name         pv-shoot--foo--bar2-40e919e4-95f2-4808-8539-a4d0547b4aff
kubernetes.io/created-for/pvc/name        pvc-name
kubernetes.io/created-for/pvc/namespace   default

Fixes #255

Release note:

Volumes provisioned with CSI will now have the in-tree volume plugin tags. Until now the CSI volumes had no tags at all. This is required to keep CSI plugin backwards-compatible with the in-tree volume plugin.

[vpnachev]

/lgtm