dataImportCronTemplates: Remove instancetype.kubevirt.io labels (#2964)

This metadata is now provided by the containerdisks project for these
imports and used by CDI to later populate the required labels on the
resulting DV and PVCs:

$ podman image inspect quay.io/containerdisks/centos-stream:8 | jq '.[] | .Config.Env'
[
  "INSTANCETYPE_KUBEVIRT_IO_DEFAULT_INSTANCETYPE=u1.medium",
  "INSTANCETYPE_KUBEVIRT_IO_DEFAULT_PREFERENCE=centos.stream8"
]

Signed-off-by: Lee Yarwood <lyarwood@redhat.com>

assets/dataImportCronTemplates/dataImportCronTemplates.yaml

@@ -2,9 +2,6 @@
     annotations:
       cdi.kubevirt.io/storage.bind.immediate.requested: "true"
     name: centos-stream8-image-cron
-    labels:
-      instancetype.kubevirt.io/default-preference: centos.stream8
-      instancetype.kubevirt.io/default-instancetype: u1.medium
   spec:
     schedule: "0 */12 * * *"
     template:
@@ -22,9 +19,6 @@
     annotations:
       cdi.kubevirt.io/storage.bind.immediate.requested: "true"
     name: centos-stream9-image-cron
-    labels:
-      instancetype.kubevirt.io/default-preference: centos.stream9
-      instancetype.kubevirt.io/default-instancetype: u1.medium
   spec:
     schedule: "0 */12 * * *"
     template:
@@ -42,9 +36,6 @@
     annotations:
       cdi.kubevirt.io/storage.bind.immediate.requested: "true"
     name: fedora-image-cron
-    labels:
-      instancetype.kubevirt.io/default-preference: fedora
-      instancetype.kubevirt.io/default-instancetype: u1.medium
   spec:
     schedule: "0 */12 * * *"
     template:
@@ -62,9 +53,6 @@
     annotations:
       cdi.kubevirt.io/storage.bind.immediate.requested: "true"
     name: centos-7-image-cron
-    labels:
-      instancetype.kubevirt.io/default-preference: centos.7
-      instancetype.kubevirt.io/default-instancetype: u1.medium
   spec:
     schedule: "0 */12 * * *"
     template: