Kopia Integration: velero failed to restore with namespace mapping

[qiuming-best]

What steps did you take and what happened:
[A clear and concise description of what the bug is, and what commands you ran.)
What did you expect to happen:
when using namespace-mappings flag to do the restore with kopia integration codes, it will failed with "pod volume restore failed: error getting backup repository: backup repository not found

velero create -n velero restore test4 --from-backup d0 --namespace-mappings nginx-exmaple:ns2 --wait
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:
[Miscellaneous information that will assist in solving the issue.]

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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