PodVolumeBackup keeps InProgress state for restic pods in OADP

Issue

• PodVolumeBackup stuck in InProgress state:

status:
  phase: InProgress
  progress: {}

• Restic pod showing throttling errors:

time="2022-07-01T09:39:24Z" level=info msg="Starting Velero restic server v1.7.1-konveyor (-)" logSource="pkg/cmd/cli/restic/server.go:87"
I0701 09:39:25.680994       1 request.go:665] Waited for 1.188499917s due to client-side throttling, not priority and fairness, request: GET:https://172.xx.xx.xx:443/apis/apiserver.openshift.io/v1?timeout=32s

• Restic pods restarting during the backup.

   - restartCount: 3