feat: enable Fedora 44 hypervisor recipe with systemd-boot

- uncomment the hypervisor recipe, targeting Fedora 44 with
  systemd-boot, hardware-support and the intelcpu variant
- make intelcpu.ks bootloader-aware: with systemd-boot kernel
  arguments must go to /etc/kernel/cmdline, not /etc/default/grub

cook/recipes_manifest.yaml

@@ -36,16 +36,16 @@ recipes:
         guest-agents: true
         initial-setup: server
 
-#  # Hypervisor variants
-#  - name: hypervisor
-#    variants:
-#      - repository: 43
-#        storage: standard
-#        bootloader: grub
-#        hardware-support: true
-#        guest-agents: false
-#        hypervisor: base
-#        hypervisor_type: ["amdcpu", "intelcpu"]
+  # Hypervisor variants
+  - name: hypervisor
+    variants:
+      - repository: ["44"]
+        storage: standard
+        bootloader: systemd-boot
+        hardware-support: true
+        guest-agents: false
+        hypervisor: base
+        hypervisor_type: intelcpu
 #
 #  # Desktop-hypervisor variants
 #  - name: desktop-hypervisor