Description of problem: As per upstream documentation: https://github.com/kubevirt/hyperconverged-cluster-operator/blob/main/docs/cluster-configuration.md#disabling-a-common-golden-image, while disabling a data import cron, user should not have to enter the whole spec of the dataimportcrontemplate. But currently the validation fails if the whole spec is not provided

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

How reproducible:
100%

Steps to Reproduce:
1. Edit hco and attempt to disable any golden image with only metadata section with annotation and name.
2. HCO rejects the update
3.

Actual results:
==========

1. Please edit the object below. Lines beginning with a '#' will be ignored,
2. and an empty file will abort the edit. If an error occurs while saving this file will be
3. reopened with the relevant failures.
   #
4. hyperconvergeds.hco.kubevirt.io "kubevirt-hyperconverged" was not valid:
5. * <nil>: Invalid value: "The edited file failed validation": ValidationError(HyperConverged.spec.dataImportCronTemplates[0]): missing required field "spec" in io.kubevirt.hco.v1beta1.HyperConverged.spec.dataImportCronTemplates
   #
   apiVersion: hco.kubevirt.io/v1beta1
   kind: HyperConverged
   metadata:
   creationTimestamp: "2022-05-20T01:42:08Z"
   finalizers:

• kubevirt.io/hyperconverged
  generation: 38
  labels:
  app: kubevirt-hyperconverged
  name: kubevirt-hyperconverged
  namespace: openshift-cnv
  resourceVersion: "23952285"
  uid: fc316af2-13e5-48c0-990d-24d2cda71b7c
  spec:
  dataImportCronTemplates:
• metadata:
  annotations:
  cdi.kubevirt.io/storage.bind.immediate.requested: "true"
  dataimportcrontemplate.kubevirt.io/enable: 'false'
  name: centos-7-image-cron
  certConfig:
  ca:
  duration: 48h0m0s
  renewBefore: 24h0m0s
  server:
  duration: 24h0m0s
  renewBefore: 12h0m0s
  featureGates:
  deployTektonTaskResources: false
  enableCommonBootImageImport: true
  nonRoot: true
  sriovLiveMigration: true
  withHostPassthroughCPU: false
  liveMigrationConfig:
  ======================

Expected results:
User should not have to provide the whole spec and metadata section of a golden image while disabling it

Additional info: