update lib/utils.sh

- add 'is_pkg_a_dependency', to ensure a package is not needed by some others before removing it
-> will be used in debian 12 CIS by at least the 2.1.5 recommendation

- update 'is_service_enabled' to use 'systemd' instead of 'rc.d', as we are now only supporting debian LTS using systemd
- add 'is_using_sbin_init' to ensure we can use systemctl, in case of running on non detected container
- add 'manage_service' to enable / disable service using systemctl

lib/utils.sh

@@ -606,7 +606,6 @@ is_pkg_a_dependency() {
             # need a 'if' even for a single sentence, due to 'set -u'
             PKG_DEPENDENCIES="$PKG_DEPENDENCIES $pkg_dep_name"
         fi
-
     done <<<"$(apt-cache rdepends "$PKG_NAME" | sed -e '1,2d' -e 's/^\ *//g' -e 's/^|//g' | sort -u)"
 
     if [ -n "$PKG_DEPENDENCIES" ]; then