Support VolumeGroupSnapshot v1 API (GA)

[iPraveenParihar]

Summary

The external-snapshotter/client/v8 (v8.6.0) has promoted
VolumeGroupSnapshot to GA (groupsnapshot.storage.k8s.io/v1).
Ceph-CSI currently uses v1beta2 throughout. This issue tracks
migrating all VGS references to the v1 GA API and support VGS for
NFS and NVME-of driver.

Changes Required

New driver support

• Implement VGS for the NFS driver nfs: add VolumeGroupSnapshot support #6392
• Implement VGS for the NVMe-oF driver nvmeof: add VolumeGroupSnapshot support #6434

Migrate to v1 GA API

• Migrate VGS e2e tests from v1beta2 to v1 for CephFS and RBD - e2e: migrate VolumeGroupSnapshot API from v1beta2 to v1 #6388
• Update Helm chart templates apiVersion from v1beta2 to v1
  for CephFS and RBD - e2e: migrate VolumeGroupSnapshot API from v1beta2 to v1 #6388

E2E and examples

• Add VGS e2e tests for NFS and NVMe-oF drivers
  • nfs: add VolumeGroupSnapshot support #6392
  • nvmeof: add VolumeGroupSnapshot support #6434
• Update/add example YAMLs to v1 for all drivers
  (CephFS, RBD, NFS, NVMe-oF)