* Remove objects when removed from manifests

If a user puts a file in /var/lib/rancher/k3s/server/manifests/ then the
objects contained therein are deployed to the cluster. If the objects
are removed from that file, they are not removed from the cluster.

This change tracks the GVKs in the files and will remove objects when
there are removed from the cluster.
Signed-off-by: Donnie Adams <donnie.adams@suse.com>