Description of problem:
When we run a migration with the "verify" option enabled, and there is corrupted data, the migmigration plan is not displaying a `ResticVerifyErrors`. Instead of that we get a `VeleroStageRestorePartiallyFailed` warning.

Version-Release number of selected component (if applicable):
TARGET CLUSTER: AWS OCP4.9 GP2 (MTC 1.6.0) (CONTROLLER + IU)
SOURCE CLUSTER: AWS OCP3.11 GP2 (MTC 1.5.1)
REPLICATION REPOSITORY: AWS S3

How reproducible:
Always

Steps to Reproduce:
1. Follow "OCP-30240 - Data validation with indirect migration" test steps

Actual results:

The migmigration resource displays this warning

12:41:14.479 - INFO: "category": "Warn",
12:41:14.480 - INFO: "durable": true,
12:41:14.482 - INFO: "lastTransitionTime": "2021-09-17T12:40:55Z",
12:41:14.483 - INFO: "message": "Stage Restore openshift-migration/ocp-30240-datavalidation-mig-1631882348-stage-lnsfb: partially failed on destination cluster",
12:41:14.484 - INFO: "status": "True",
12:41:14.485 - INFO: "type": "VeleroStageRestorePartiallyFailed"
12:41:14.485 - INFO: },



The podvolumerestore resource is displaying this error

status:
  completionTimestamp: "2021-09-17T12:49:22Z"
  message: |-
    error restoring volume: error running restic restore, cmd=restic restore --repo=s3:s3-us-east-2.amazonaws.com/camreplication/velero/restic/ocp-30240-datavalidation --password-file=/tmp/credentials/openshift-migration/velero-restic-credentials-repository-password --cache-dir=/scratch/.cache/restic 8b2700ff --target=. --delete --verify, stdout=restoring <Snapshot 8b2700ff of [/host_pods/fecb458b-17b4-11ec-97b2-0ef8128329e3/volumes/kubernetes.io~aws-ebs/pvc-feb97997-17b4-11ec-97b2-0ef8128329e3] at 2021-09-17 12:49:03.908299474 +0000 UTC by root@velero> to .
    verifying files in .
    , stderr=ignoring error for /index.html: Invalid file size: expected 21 got 0
    Fatal: There were 1 errors
 
    : exit status 1
  phase: Failed
  progress:
    bytesDone: 21
    totalBytes: 21
  startTimestamp: "2021-09-17T12:49:20Z"


The restore resource is displaying this error:

status:
  completionTimestamp: "2021-09-17T12:49:24Z"
  errors: 1
  phase: PartiallyFailed
  progress:
    itemsRestored: 6
    totalItems: 6
  startTimestamp: "2021-09-17T12:49:07Z"
  warnings: 2


If we describe the restore resource we get this error:

Errors:
  Velero:  pod volume restore failed: error restoring volume: error running restic restore, cmd=restic restore --repo=s3:s3-us-east-2.amazonaws.com/camreplication/velero/restic/ocp-30240-datavalidation --password-file=/tmp/credentials/openshift-migration/velero-restic-credentials-repository-password --cache-dir=/scratch/.cache/restic 8b2700ff --target=. --delete --verify, stdout=restoring <Snapshot 8b2700ff of [/host_pods/fecb458b-17b4-11ec-97b2-0ef8128329e3/volumes/kubernetes.io~aws-ebs/pvc-feb97997-17b4-11ec-97b2-0ef8128329e3] at 2021-09-17 12:49:03.908299474 +0000 UTC by root@velero> to .
verifying files in .
, stderr=ignoring error for /index.html: Invalid file size: expected 21 got 0
Fatal: There were 1 errors
 
: exit status 1
  Cluster:    <none>
  Namespaces: <none>



In the restic pod we can see this error:

time="2021-09-17T12:47:06Z" level=info msg="Ran command=restic restore --repo=s3:s3-us-east-2.amazonaws.com/camreplication/velero/restic/ocp-30240-datavalidation --password-file=/tmp/credentials/openshift-migration/velero-restic-credentials-repository-password --cache-dir=/scratch/.cache/restic 35cc7b9a --target=. --delete --verify, stdout=restoring <Snapshot 35cc7b9a of [/host_pods/fecb458b-17b4-11ec-97b2-0ef8128329e3/volumes/kubernetes.io~aws-ebs/pvc-feb97997-17b4-11ec-97b2-0ef8128329e3] at 2021-09-17 12:46:22.060127014 +0000 UTC by root@velero> to .\nverifying files in .\nfinished verifying 1 files in .\n, stderr=" controller=pod-volume-restore logSource="pkg/controller/pod_volume_restore_controller.go:399" name=ocp-30240-datavalidation-mig-1631882720-stage-phas-stage-zm5drc namespace=openshift-migration restore=openshift-migration/ocp-30240-datavalidation-mig-1631882720-stage-phas-stage-zfqfh
time="2021-09-17T12:47:06Z" level=info msg="Restore completed" controller=pod-volume-restore logSource="pkg/controller/pod_volume_restore_controller.go:323" name=ocp-30240-datavalidation-mig-1631882720-stage-phas-stage-zm5drc namespace=openshift-migration restore=openshift-migration/ocp-30240-datavalidation-mig-1631882720-stage-phas-stage-zfqfh
time="2021-09-17T12:47:06Z" level=info msg="Restore starting" controller=pod-volume-restore logSource="pkg/controller/pod_volume_restore_controller.go:282" name=ocp-30240-datavalidation-mig-1631882720-stage-phas-stage-z9gz8w namespace=openshift-migration restore=openshift-migration/ocp-30240-datavalidation-mig-1631882720-stage-phas-stage-zfqfh
time="2021-09-17T12:47:08Z" level=info msg="Ran command=restic restore --repo=s3:s3-us-east-2.amazonaws.com/camreplication/velero/restic/ocp-30240-datavalidation --password-file=/tmp/credentials/openshift-migration/velero-restic-credentials-repository-password --cache-dir=/scratch/.cache/restic 2cb7df66 --target=. --delete --verify, stdout=restoring <Snapshot 2cb7df66 of [/host_pods/fecb458b-17b4-11ec-97b2-0ef8128329e3/volumes/kubernetes.io~aws-ebs/pvc-feb4a4b2-17b4-11ec-97b2-0ef8128329e3] at 2021-09-17 12:46:19.488067273 +0000 UTC by root@velero> to .\nverifying files in .\nfinished verifying 2 files in .\n, stderr=" controller=pod-volume-restore logSource="pkg/controller/pod_volume_restore_controller.go:399" name=ocp-30240-datavalidation-mig-1631882720-stage-phas-stage-z9gz8w namespace=openshift-migration restore=openshift-migration/ocp-30240-datavalidation-mig-1631882720-stage-phas-stage-zfqfh
time="2021-09-17T12:47:08Z" level=info msg="Restore completed" controller=pod-volume-restore logSource="pkg/controller/pod_volume_restore_controller.go:323" name=ocp-30240-datavalidation-mig-1631882720-stage-phas-stage-z9gz8w namespace=openshift-migration restore=openshift-migration/ocp-30240-datavalidation-mig-1631882720-stage-phas-stage-zfqfh
time="2021-09-17T12:49:20Z" level=info msg="Restore starting" controller=pod-volume-restore logSource="pkg/controller/pod_volume_restore_controller.go:282" name=ocp-30240-datavalidation-mig-1631882901-stage-jzq7g-5mmnv namespace=openshift-migration restore=openshift-migration/ocp-30240-datavalidation-mig-1631882901-stage-jzq7g
time="2021-09-17T12:49:22Z" level=error msg="Error restoring volume" controller=pod-volume-restore error="error running restic restore, cmd=restic restore --repo=s3:s3-us-east-2.amazonaws.com/camreplication/velero/restic/ocp-30240-datavalidation --password-file=/tmp/credentials/openshift-migration/velero-restic-credentials-repository-password --cache-dir=/scratch/.cache/restic 8b2700ff --target=. --delete --verify, stdout=restoring <Snapshot 8b2700ff of [/host_pods/fecb458b-17b4-11ec-97b2-0ef8128329e3/volumes/kubernetes.io~aws-ebs/pvc-feb97997-17b4-11ec-97b2-0ef8128329e3] at 2021-09-17 12:49:03.908299474 +0000 UTC by root@velero> to .\nverifying files in .\n, stderr=ignoring error for /index.html: Invalid file size: expected 21 got 0\nFatal: There were 1 errors\n\n: exit status 1" error.file="/go/src/github.com/vmware-tanzu/velero/pkg/controller/pod_volume_restore_controller.go:397" error.function="github.com/vmware-tanzu/velero/pkg/controller.(*podVolumeRestoreController).restorePodVolume" logSource="pkg/controller/pod_volume_restore_controller.go:310" name=ocp-30240-datavalidation-mig-1631882901-stage-jzq7g-5mmnv namespace=openshift-migration restore=openshift-migration/ocp-30240-datavalidation-mig-1631882901-stage-jzq7g
time="2021-09-17T12:49:22Z" level=info msg="Restore starting" controller=pod-volume-restore logSource="pkg/controller/pod_volume_restore_controller.go:282" name=ocp-30240-datavalidation-mig-1631882901-stage-jzq7g-j2nxn namespace=openshift-migration restore=openshift-migration/ocp-30240-datavalidation-mig-1631882901-stage-jzq7g
time="2021-09-17T12:49:24Z" level=info msg="Ran command=restic restore --repo=s3:s3-us-east-2.amazonaws.com/camreplication/velero/restic/ocp-30240-datavalidation --password-file=/tmp/credentials/openshift-migration/velero-restic-credentials-repository-password --cache-dir=/scratch/.cache/restic e3a4a92a --target=. --delete --verify, stdout=restoring <Snapshot e3a4a92a of [/host_pods/fecb458b-17b4-11ec-97b2-0ef8128329e3/volumes/kubernetes.io~aws-ebs/pvc-feb4a4b2-17b4-11ec-97b2-0ef8128329e3] at 2021-09-17 12:49:01.578486552 +0000 UTC by root@velero> to .\nverifying files in .\nfinished verifying 2 files in .\n, stderr=" controller=pod-volume-restore logSource="pkg/controller/pod_volume_restore_controller.go:399" name=ocp-30240-datavalidation-mig-1631882901-stage-jzq7g-j2nxn namespace=openshift-migration restore=openshift-migration/ocp-30240-datavalidation-mig-1631882901-stage-jzq7g
time="2021-09-17T12:49:24Z" level=info msg="Restore completed" controller=pod-volume-restore logSource="pkg/controller/pod_volume_restore_controller.go:323" name=ocp-30240-datavalidation-mig-1631882901-stage-jzq7g-j2nxn namespace=openshift-migration restore=openshift-migration/ocp-30240-datavalidation-mig-1631882901-stage-jzq7g


Expected results:
The migmigration resource should display a `ResticVerifyErrors` warning instead of a `VeleroStageRestorePartiallyFailed` warning.

Additional info: