Description of problem:
In VirtualMachine status.volumeSnapshotStatuses[*].reason for some volumes types is wrong,
for example ConfigMap volumes don't need storage class, but the reason for it's none snapshot state is that it's lacking storage class.

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


How reproducible:


Steps to Reproduce:
1. create a virtual machine with ephimeral, configMap (or other none snpashotable disk)
2. check VirtualMachine status.volumeSnapshotStatuses[*].reason
3.

Actual results:
"Volume type has no StorageClass defined"

Expected results:
"Snapshots are not supported for [containerDisk/CloudInit ...] volumes" (or a similar mreason)

Additional info:
list of volume types:
https://kubevirt.io/user-guide/virtual_machines/disks_and_volumes/#volumes

    cloudInitNoCloud       not?
    cloudInitConfigDrive   not?
    persistentVolumeClaim  snapshotable?
    dataVolume             snapshotable?
    ephemeral              not?
    containerDisk          not?
    emptyDisk              not?
    hostDisk               not?
    configMap              not?
    secret                 not?
    serviceAccount         not?
    downwardMetrics        not?