Use Ubuntu 22.04 for new VMs

Also, remove the custom config image generation and replace it with
`--cloud-init` options.

site-cookbooks/kosmos_kvm/attributes/default.rb

@@ -1,9 +1,9 @@
-ubuntu_server_cloud_image_release = "20231026"
+release = "20240514"
 
 node.default["kosmos_kvm"]["host"]["qemu_base_image"] = {
-  "url" => "https://cloud-images.ubuntu.com/releases/jammy/release-#{ubuntu_server_cloud_image_release}/ubuntu-22.04-server-cloudimg-amd64-disk-kvm.img",
+  "url" => "https://cloud-images.ubuntu.com/releases/jammy/release-#{release}/ubuntu-22.04-server-cloudimg-amd64-disk-kvm.img",
-  "checksum" => "b5d1f937341fbb3afb50d28c4a17f41419df4d87a96d5e737a39b6cb42e1dff3",
+  "checksum" => "2e7698b3ebd7caead06b08bd3ece241e6ce294a6db01f92ea12bcb56d6972c3f",
-  "path" => "/var/lib/libvirt/images/base/ubuntu-22.04-server-cloudimg-amd64-disk-kvm-#{ubuntu_server_cloud_image_release}.qcow2"
+  "path" => "/var/lib/libvirt/images/base/ubuntu-22.04-server-cloudimg-amd64-disk-kvm-#{release}.qcow2"
 }
 
 # A systemd.timer OnCalendar config value