Osbuild should create network installer options during the compose process

[pcdubs]

Since moving to osbuild for the IoT installer, we no longer produce the network installer bits needed for things like PXE boot or HTTP boot.

Example in Fedora 39:
https://kojipkgs.fedoraproject.org/compose/iot/Fedora-IoT-39-20240118.0/compose/IoT/x86_64/os/

Now in Fedora 40:
https://kojipkgs.fedoraproject.org/compose/iot/Fedora-IoT-40-20240118.0/compose/IoT/x86_64/

Included on the osbuild produced installer iso:

EFI
└── BOOT
    ├── BOOTAA64.EFI
    ├── fonts
    │   └── unicode.pf2
    ├── grubaa64.efi
    ├── grub.cfg
    └── mmaa64.efi
images
├── efiboot.img
├── install.img
└── pxeboot
    ├── initrd.img
    └── vmlinuz

Also missing from F40 is the boot.iso. F39 boot.iso.