Description of problem:
disk.img size is smaller than requested on 'px-csi-db-shared' storage class with

when creating a 13Gi DV/PVC.

Version-Release number of selected component (if applicable):
4.14

How reproducible:
Always

Steps to Reproduce:

1. Create a DV with 13Gi storage request:

apiVersion: cdi.kubevirt.io/v1beta1
kind: DataVolume
metadata:
  name: cnv-6536
  namespace: cdi-import-test-import-htt
spec:
  contentType: kubevirt
  source:
    http:
      certConfigMap: internal-https-configmap
      url: https://internal-http.cnv-tests-utilities/cirros-qcow2.img
  storage:
    resources:
      requests:
        storage: 13Gi
    storageClassName: px-csi-db-shared

2. Create a pod that uses this PVC (attaching the yaml)

3. Check the disk.img virtual size, see it's 12G instead of 13Gi:

$ oc exec cnv-6536-pod --namespace=cdi-import-test-import-htt – qemu-img info /pvc/disk.img
image: /pvc/disk.img
file format: raw
virtual size: 12G (13153337344 bytes)
disk size: 13M

4. See the reported PVC capacity is 14Gi:

$ oc get pvc -n cdi-import-test-import-htt
NAME       STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS       AGE
cnv-6536   Bound    pvc-292dbf65-8a7b-4e11-a27e-f0268858d160   14Gi       RWX            px-csi-db-shared   46m

$ oc get pvc -n cdi-import-test-import-htt cnv-6536 -oyaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  annotations:
    cdi.kubevirt.io/storage.condition.running: "false"
    cdi.kubevirt.io/storage.condition.running.message: Import Complete
    cdi.kubevirt.io/storage.condition.running.reason: Completed
    cdi.kubevirt.io/storage.contentType: kubevirt
    cdi.kubevirt.io/storage.pod.phase: Succeeded
    cdi.kubevirt.io/storage.pod.restarts: "1"
    cdi.kubevirt.io/storage.populator.progress: 100.0%
    cdi.kubevirt.io/storage.preallocation.requested: "false"
    cdi.kubevirt.io/storage.usePopulator: "true"
    pv.kubernetes.io/bind-completed: "yes"
    pv.kubernetes.io/bound-by-controller: "yes"
    volume.beta.kubernetes.io/storage-provisioner: pxd.portworx.com
    volume.kubernetes.io/storage-provisioner: pxd.portworx.com
  creationTimestamp: "2023-09-04T13:19:23Z"
  finalizers:
  - kubernetes.io/pvc-protection
  labels:
    alerts.k8s.io/KubePersistentVolumeFillingUp: disabled
    app: containerized-data-importer
    app.kubernetes.io/component: storage
    app.kubernetes.io/managed-by: cdi-controller
    app.kubernetes.io/part-of: hyperconverged-cluster
    app.kubernetes.io/version: 4.14.0
    created-by-dynamic-class-creator: "Yes"
  name: cnv-6536
  namespace: cdi-import-test-import-htt
  ownerReferences:
  - apiVersion: cdi.kubevirt.io/v1beta1
    blockOwnerDeletion: true
    controller: true
    kind: DataVolume
    name: cnv-6536
    uid: cb1f6397-bd7b-45de-bd42-86185ceebfd4
  resourceVersion: "340909"
  uid: 824bb4e9-1132-4be8-a282-65b7e3acb31d
spec:
  accessModes:
  - ReadWriteMany
  dataSource:
    apiGroup: cdi.kubevirt.io
    kind: VolumeImportSource
    name: volume-import-source-cb1f6397-bd7b-45de-bd42-86185ceebfd4
  dataSourceRef:
    apiGroup: cdi.kubevirt.io
    kind: VolumeImportSource
    name: volume-import-source-cb1f6397-bd7b-45de-bd42-86185ceebfd4
  resources:
    requests:
      storage: "14771051548"
  storageClassName: px-csi-db-shared
  volumeMode: Filesystem
  volumeName: pvc-292dbf65-8a7b-4e11-a27e-f0268858d160
status:
  accessModes:
  - ReadWriteMany
  capacity:
    storage: 14Gi
  phase: Bound

Actual results:
Virtual image size is smaller than requested

Expected results:
Virtual image size is the same as requested

Additional info:
We don't see this issue with the requested size 64Mi and 1Gi - virtual image size is the same as requested.