Revert EL8 Python bootstrap and Calico CI (#13596)

This reverts commit e19d1c9a55.

Allow further maintainer discussion without introducing additional changes.

Signed-off-by: Kay Yan <kay.yan@daocloud.io>

.gitlab-ci/kubevirt.yml

@@ -45,7 +45,6 @@ pr:
           - fedora43-kube-router
           - opensuse-leap16-calico
           - rockylinux10-cilium
-          - rockylinux8-calico
           - rockylinux9-cilium
           - ubuntu22-calico-all-in-one
           - ubuntu22-calico-all-in-one-upgrade
@@ -115,14 +114,13 @@ pr_full:
           - ubuntu24-flannel-ha
           - ubuntu24-flannel-ha-once
 
-# Experimental OS coverage and images needing maintenance.
+# Need an update of the container image to use schema v2
+# update: quay.io/kubespray/vm-amazon-linux-2:latest
 manual:
   extends: pr_full
   parallel:
     matrix:
       - TESTCASE:
-          - almalinux8-calico
-          # Needs a schema v2 update to quay.io/kubespray/vm-amazon-linux-2:latest.
           - amazon-linux-2-all-in-one
   rules:
     - when: manual