Description of problem:
VM restore PVC uses exact source PVC request size, discarding the possibility that status.capacity.storage (and thus volumesnapshot.status.restoreSize) is different

Version-Release number of selected component (if applicable):
CNV 4.11.0

How reproducible:
100%

Steps to Reproduce:
1. Attempt to restore a VM with PVC whose spec.storage != status.capacity (manifests below)

Actual results:
ceph csi driver does not allow srcSize != targetSize, restored PVC Pending:
Warning ProvisioningFailed 116s (x11 over 9m24s) openshift-storage.rbd.csi.ceph.com_csi-rbdplugin-provisioner-7d96f8b4d5-s6lzj_dc0077ff-a0f2-4034-ae60-c6e15766ee54 failed to provision volume with StorageClass "ocs-storagecluster-ceph-rbd": error getting handle for DataSource Type VolumeSnapshot by Name vmsnapshot-74690574-f6a4-457c-8682-c830f74d5e0b-volume-dv-disk: requested volume size 8053063680 is less than the size 8589934592 for the source snapshot vmsnapshot-74690574-f6a4-457c-8682-c830f74d5e0b-volume-dv-disk

Expected results:
Success

Additional info:
Reproduced on OCS using 7.5Gi which gets round-up by the provisioner
[akalenyu@localhost manifests]$ oc get pvc simple-dv -o yaml | grep storage:
storage: 7680Mi
storage: 8Gi

[akalenyu@localhost manifests]$ cat dv.yaml
apiVersion: cdi.kubevirt.io/v1beta1
kind: DataVolume
metadata:
name: simple-dv
namespace: akalenyu
spec:
source:
http:
url: "http://.../Fedora-Cloud-Base-34-1.2.x86_64.qcow2"
pvc:
storageClassName: ocs-storagecluster-ceph-rbd
accessModes:

• ReadWriteOnce
  resources:
  requests:
  storage: 7.5Gi
  [akalenyu@localhost manifests]$ cat vm.yaml
  apiVersion: kubevirt.io/v1
  kind: VirtualMachine
  metadata:
  name: simple-vm
  spec:
  running: true
  template:
  metadata:
  labels: {kubevirt.io/domain: simple-vm, kubevirt.io/vm: simple-vm}

  spec:
  domain:
  devices:
  disks:

• disk: {bus: virtio}

  name: dv-disk

• disk: {bus: virtio}

  name: cloudinitdisk
  resources:
  requests:

  {memory: 2048M}

  volumes:

• dataVolume: {name: simple-dv}

  name: dv-disk

• cloudInitNoCloud:
  userData: |
  #cloud-config
  password: fedora
  chpasswd: { expire: False }

  name: cloudinitdisk
  [akalenyu@localhost manifests]$ cat snapshot.yaml
  apiVersion: snapshot.kubevirt.io/v1alpha1
  kind: VirtualMachineSnapshot
  metadata:
  name: snap-simple-vm
  spec:
  source:
  apiGroup: kubevirt.io
  kind: VirtualMachine
  name: simple-vm
  [akalenyu@localhost manifests]$ cat restore.yaml
  apiVersion: snapshot.kubevirt.io/v1alpha1
  kind: VirtualMachineRestore
  metadata:
  name: restore-simple-vm
  spec:
  target:
  apiGroup: kubevirt.io
  kind: VirtualMachine
  name: simple-vm
  virtualMachineSnapshotName: snap-simple-vm