AddCephVersionLabelToDaemonSet had no callers anywhere in the repo
(verified with deadcode and repo-wide grep); rook applies ceph version
labels to Deployments, Jobs, and object metas, but never to DaemonSets.
The shared addCephVersionLabel helper remains in use by the live
siblings.
Signed-off-by: Joshua Hoblitt <josh@hoblitt.com>