legacy installkernel also installs config and System.map, clean these up if we can find them
UKIs may be installed without an installation of systemd-boot present on the ESP, this means we have UKI's in ESP/EFI/Linux but no ESP/loader directory. Extend ESP finding logic to also take into account this case.
ESP/EFI/Linux
but noESP/loader
directory. Extend ESP finding logic to also take into account this case.