add a new field spec.EnableCommonBootImageImport and deprecate the old spec.featureGates.EnableCommonBootImageImport:

• Add the new spec.EnableCommonBootImageImport field, with the default value of "true" (x 2 places in the hyperconverged_types.go file)
• Change the HCO code logic to only use the new field
• deprecate the spec.featureGates.EnableCommonBootImageImport field; add a commet that this field is ignored. Remove the default value from the deprecated field (x 3 places in the hyperconverged_types.go file).
• Add 2 json patch entries to the upgradePatches.json file; This should be done both in upstream and downstream:
  • Check if the deprecated field value is "false", and if this is the case, copy the deprecated field value to the new field.
  • Remove the deprecated field.
• Upstream documentation: Fix the documentation in docs/cluster-configuration.md, to point only to the new field.