Templates should setup "systemd-preset" (issue: Fedora 37 templates disable systemd-networkd on first boot)

[Blub]

Currently the template scripts manually create symlinks to enable/disable systemd services.

For instance, the fedora template script explicitly enables systemd-networkd, but systemd reverts back to the 'preset' state whenever there's no /etc/machine-id file at boot time, where fedora now explicitly disables systemd-networkd in favor of NetworkManager.
This is done via /usr/lib/systemd/system-preset/90-default.preset.

The template should probably additionally also ship a preset (eg. /etc/systemd/system-preset/00-lxc.preset or something) containin the enable systemd-networkd.service line (and potentially others that get enabled).

While this behavior is somewhat awkward, it'll probably also be "safer" as eg. systemd-networkd.service contains an Alias= and a few Also= lines by now which aren't taken into account in the template scripts either.