CI: remove RHEL8-related OS tests

Signed-off-by: ChengHao Yang <17496418+tico88612@users.noreply.github.com>

.gitlab-ci/kubevirt.yml

@@ -34,7 +34,6 @@ pr:
   parallel:
     matrix:
       - TESTCASE:
-          - almalinux8-calico
           - almalinux9-crio
           - almalinux9-kube-ovn
           - debian11-calico-collection
@@ -44,7 +43,6 @@ pr:
             # FIXME: this test if broken (perma-failing)
           - openeuler24-calico
           - opensuse15-6-calico
-          - rockylinux8-calico
           - rockylinux9-cilium
           - ubuntu22-calico-all-in-one
           - ubuntu22-calico-all-in-one-upgrade

tests/files/almalinux8-calico.yml

@@ -1,8 +0,0 @@
----
-# Instance settings
-cloud_image: almalinux-8
-vm_memory: 3072
-
-# Workaround for RHEL8: kernel version 4.18 is lower than Kubernetes system verification.
-kubeadm_ignore_preflight_errors:
-  - SystemVerification

tests/files/rockylinux8-calico.yml

@@ -1,14 +0,0 @@
----
-# Instance settings
-cloud_image: rockylinux-8
-vm_memory: 3072
-
-# Kubespray settings
-metrics_server_enabled: true
-dashboard_namespace: "kube-dashboard"
-dashboard_enabled: true
-loadbalancer_apiserver_type: haproxy
-
-# Workaround for RHEL8: kernel version 4.18 is lower than Kubernetes system verification.
-kubeadm_ignore_preflight_errors:
-  - SystemVerification