ovn-kubernetes: use OCP-matching CNV version for BGP virt jobs on 4.22 (#77970)

The BGP virt periodic jobs were setting CNV_PRERELEASE_LATEST_CHANNEL
to "true", which hardcodes cnv_version=4.99 in the kubevirt-install
step. This installs a non-existent CNV version instead of the one
matching the OCP cluster. Setting to "false" makes the install script
derive the version dynamically from the cluster (4.22).

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mkowalski

ci-operator/config/openshift/ovn-kubernetes/openshift-ovn-kubernetes-release-4.22__periodics.yaml

@@ -78,7 +78,7 @@ tests:
   steps:
     cluster_profile: equinix-ocp-metal
     env:
-      CNV_PRERELEASE_LATEST_CHANNEL: "true"
+      CNV_PRERELEASE_LATEST_CHANNEL: "false"
     workflow: baremetalds-e2e-ovn-bgp-virt-dualstack
 - as: e2e-metal-ipi-ovn-bgp-virt-dualstack-techpreview
   capabilities:
@@ -87,7 +87,7 @@ tests:
   steps:
     cluster_profile: equinix-ocp-metal
     env:
-      CNV_PRERELEASE_LATEST_CHANNEL: "true"
+      CNV_PRERELEASE_LATEST_CHANNEL: "false"
       FEATURE_SET: TechPreviewNoUpgrade
     workflow: baremetalds-e2e-ovn-bgp-virt-dualstack
 - as: e2e-metal-ipi-ovn-bgp-virt-ipv4-techpreview
@@ -97,7 +97,7 @@ tests:
   steps:
     cluster_profile: equinix-ocp-metal
     env:
-      CNV_PRERELEASE_LATEST_CHANNEL: "true"
+      CNV_PRERELEASE_LATEST_CHANNEL: "false"
       FEATURE_SET: TechPreviewNoUpgrade
     workflow: baremetalds-e2e-ovn-bgp-virt-ipv4
 - as: e2e-metal-ipi-ovn-bgp-virt-ipv4
@@ -107,7 +107,7 @@ tests:
   steps:
     cluster_profile: equinix-ocp-metal
     env:
-      CNV_PRERELEASE_LATEST_CHANNEL: "true"
+      CNV_PRERELEASE_LATEST_CHANNEL: "false"
     workflow: baremetalds-e2e-ovn-bgp-virt-ipv4
 zz_generated_metadata:
   branch: release-4.22