Fedora 39 edk2-ovmf updates

[kostyanf14]

edk2-ovmf package was updated and the OVMF binary was renamed.
We need to support the qcow2 format for OVMF. Update the installer to locate the proper files.
Check the CentOS Stream package.

"executable": {
            "filename": "/usr/share/edk2/ovmf/OVMF_CODE_4M.secboot.qcow2",
            "format": "qcow2"
        },
        "nvram-template": {
            "filename": "/usr/share/edk2/ovmf/OVMF_VARS_4M.secboot.qcow2",
            "format": "qcow2"
        }