ci: bump EOL Fedora versions to 42/43 (#13206)

Fedora 39 (EOL 2024-11-26), Fedora 40 (EOL 2025-05-13), and Fedora 41
(EOL 2025-12-15) are all out of support and no longer receive security
updates. This bumps the kubevirt CI test matrix to currently supported
releases, distributing tests across Fedora 42 (supported until
2026-05-13) and Fedora 43 (supported until 2026-12-09) to keep
multi-version coverage.

- Add fedora-43 image entry to the kubevirt image-builder
- Rename fedora39-* tests to fedora43-* (4 tests)
- Rename fedora40-* tests to fedora43-* (2 tests)
- Rename fedora41-* tests to fedora42-* (4 tests)
- Update .gitlab-ci/kubevirt.yml testcase names
- Regenerate docs/developers/ci.md

All 10 existing Fedora test configurations (kube-router, calico-selinux,
calico-swap-selinux, crio with/without SELinux enforcing, docker-calico,
flannel-crio-collection-scale) are preserved.

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

tests/files/fedora42-calico-selinux.yml

@@ -1,6 +1,6 @@
 ---
 # Instance settings
-cloud_image: fedora-39
+cloud_image: fedora-42
 
 # Kubespray settings
 auto_renew_certificates: true

tests/files/fedora42-calico-swap-selinux.yml

@@ -1,6 +1,6 @@
 ---
 # Instance settings
-cloud_image: fedora-41
+cloud_image: fedora-42
 
 # Kubespray settings
 auto_renew_certificates: true

tests/files/fedora42-crio.yml

@@ -1,6 +1,6 @@
 ---
 # Instance settings
-cloud_image: fedora-41
+cloud_image: fedora-42
 
 # Kubespray settings
 container_manager: crio

tests/files/fedora42-kube-router.yml

@@ -1,5 +1,5 @@
 ---
-cloud_image: fedora-41
+cloud_image: fedora-42
 cluster_layout:
   - node_groups: ['kube_control_plane', 'etcd', 'kube_node']
   - node_groups: ['kube_node']

tests/files/fedora43-calico-selinux.yml

@@ -1,6 +1,6 @@
 ---
 # Instance settings
-cloud_image: fedora-41
+cloud_image: fedora-43
 
 # Kubespray settings
 auto_renew_certificates: true

tests/files/fedora43-calico-swap-selinux.yml

@@ -1,6 +1,6 @@
 ---
 # Instance settings
-cloud_image: fedora-39
+cloud_image: fedora-43
 
 # Kubespray settings
 auto_renew_certificates: true

tests/files/fedora43-crio.yml

@@ -1,6 +1,6 @@
 ---
 # Instance settings
-cloud_image: fedora-39
+cloud_image: fedora-43
 
 # Kubespray settings
 container_manager: crio

tests/files/fedora43-docker-calico.yml

@@ -1,6 +1,6 @@
 ---
 # Instance settings
-cloud_image: fedora-40
+cloud_image: fedora-43
 
 # Kubespray settings
 auto_renew_certificates: true

tests/files/fedora43-flannel-crio-collection-scale.yml

@@ -1,5 +1,5 @@
 ---
-cloud_image: fedora-40
+cloud_image: fedora-43
 network_plugin: flannel
 container_manager: crio
 

tests/files/fedora43-kube-router.yml

@@ -1,5 +1,5 @@
 ---
-cloud_image: fedora-39
+cloud_image: fedora-43
 cluster_layout:
   - node_groups: ['kube_control_plane', 'etcd', 'kube_node']
   - node_groups: ['kube_node']