Deprecate the support for backup without VolumeInfo metadata

[blackpiglet]

Describe the problem/challenge you have

In the v1.13 release note's Deprecation Announcement section: https://github.com/vmware-tanzu/velero/releases/v1.13.0/, support for the backup without the VolumeInfo metadata file is announced deprecated, which means not supporting restore the backup without VolumeInfo metadata.

After removing this support for the Backup without VolumeInfo metadata, the legacy backup's PV data cannot be restored.

This piece of code will be deleted to deprecate the support. https://github.com/vmware-tanzu/velero/blob/d4e743b138be03d7491a7408058580d2c8ae71aa/pkg/restore/restore.go#L1246-L1295

Please check whether it's OK to make the change in v1.15. @shubham-pampattiwar @sseago @Lyndon-Li @reasonerjt @anshulahuja98 @kaovilai

Describe the solution you'd like

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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