tier-x: Drop systemd-resolved

Colin Walters (Red Hat)requested to merge
walters2/fedora-bootc-base-images:drop-resolved-centos into main

It's not desired by default in RHEL 10 or below yet, ref https://issues.redhat.com/browse/RHEL-77077

AFAICS, it's already explicitly specified in the fedora-coreos manifest, so dropping it here shouldn't affect FCOS.

Of course I think what we really want here is distribution conditionals.

Signed-off-by: Colin Walters walters@verbum.org

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