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/fedora39-calico-swap-selinux.yml

@@ -0,0 +1,14 @@
+---
+# Instance settings
+cloud_image: fedora-39
+
+# Kubespray settings
+auto_renew_certificates: true
+
+# Test with SELinux in enforcing mode
+preinstall_selinux_state: enforcing
+
+# Test Alpha swap feature by leveraging zswap default config in Fedora 35
+kubelet_fail_swap_on: false
+kube_feature_gates:
+  - "NodeSwap=True"