There's an official virtio-win-guest-tools installer. We should explore whether we can use it to replace a lot of our windows firstboot process.

• installed by the virtio-win rpm at /usr/share/virtio-win/installer/virtio-win-guest-tools.exe (and MSI files if they are more appropriate)
• upstream code: https://github.com/virtio-win/virtio-win-guest-tools-installer
• maintained by our virtio-win team
• installs full drivers and blnsvr, qemu guest agent, spice agent, spice video drivers
• used by RHEV since 2020ish