investigate issues with stargz failing to startup after node has been restarted

see: INC4455841

after node restart, the setup script for containerd fails to run as the unit files are already in place and in use by systemd (as the node is already been configured to run stargz)

Kostas has patched this by piping the copy command to true, we should investigate adding a check to only run if systemd is not already configured for containerd