fix(system-upgrades): Workaround potential script failures

Currently various scriptlets fail as part of `dnf upgrade -y` due to
SELinux transitions conflicting with `spc_t`. Which also prevented a
proper kernel update.

Therefore this solution just triggers the right systemd job, that should
take care of the update, before checking if we need to reboot the
machine.

References:
https://danwalsh.livejournal.com/74754.html