CSI plugin should not drop PVC when restorePVs is false

[blackpiglet]

What steps did you take and what happened:

PR https://github.com/vmware-tanzu/velero-plugin-for-csi/pull/127 makes the CSI plugin also honor the restorePVs flag setting in velero's restore, but the change makes PVC skipped. This makes the pods pending after restoration.

What did you expect to happen: PVC should be restored but without the data.

The following information will help us better understand what's going on:

If you are using velero v1.7.0+:
Please use velero debug --backup <backupname> --restore <restorename> to generate the support bundle, and attach to this issue, more options please refer to velero debug --help

If you are using earlier versions:
Please provide the output of the following commands (Pasting long output into a GitHub gist or other pastebin is fine.)

• kubectl logs deployment/velero -n velero
• velero backup describe <backupname> or kubectl get backup/<backupname> -n velero -o yaml
• velero backup logs <backupname>
• velero restore describe <restorename> or kubectl get restore/<restorename> -n velero -o yaml
• velero restore logs <restorename>

Anything else you would like to add:

Environment:

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

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[reasonerjt]

It's a dup of #6056

Closing this one and track the status via #6056