Implement VoulumeGroupSnapshot (VGS) support in Velero

[shubham-pampattiwar]

Describe the problem/challenge you have

Parent issue describing the problem: #8447

Describe the solution you'd like

Design for the solution: #8778

Major tasks involved in the implementation:

• Accept the label to be used for VGS from the user #8934
• Changes to the Existing PVC ItemBlockAction plugin #8935
• Updates to CSI PVC plugin #8936

Anything else you would like to add:

Environment:

• Velero version (use velero version):
• Kubernetes version (use kubectl version):
• Kubernetes installer & version:
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):

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