test(archsetup): branch boot/backup checks on the ZFS boot path

The Testinfra boot and backup checks asserted btrfs behavior unconditionally, so they failed on a ZFS root once the ZFS VM path started running them. ZFS boots via ZFSBootMenu, not GRUB. archsetup skips the systemd-hook switch and the mkinitcpio rebuild on ZFS, and on a ZFS+virtio VM it never edits mkinitcpio.conf at all. Branch each check on the existing zfs_root/has_nvme fixtures: assert the ZFSBootMenu EFI binary on ZFS (GRUB on btrfs), gate the mkinitcpio.conf backup on archsetup actually editing the file, and check the console font in /etc/vconsole.conf on ZFS (the initramfs on non-ZFS).

Surfaced by the first full ZFS VM run, which completed archsetup cleanly (exit 0). These were the only 3 failures.

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