CI: streamline packet jobs definition

- Take advantage of `parallel:matrix` to make the jobs definition shorter
  and more readable.
- Remove helper scripts which are no longer needed
- Remove redundant indirection in the gitlab-ci pipelines definitions
  (only one user)

tests/files/almalinux9-calico.yml

@@ -0,0 +1,23 @@
+---
+# Instance settings
+cloud_image: almalinux-9
+vm_memory: 3072
+
+# Kubespray settings
+metrics_server_enabled: true
+dashboard_namespace: "kube-dashboard"
+dashboard_enabled: true
+loadbalancer_apiserver_type: haproxy
+local_path_provisioner_enabled: true
+
+kube_proxy_mode: nftables
+
+# NTP mangement
+ntp_enabled: true
+ntp_timezone: Etc/UTC
+ntp_manage_config: true
+ntp_tinker_panic: true
+ntp_force_sync_immediately: true
+
+# Scheduler plugins
+scheduler_plugins_enabled: true