Fix nerdctl create --restart=unless-stopped restart policy behaviour inconsistent with docker

[yankay]

The PR is to fix the #2270 by using the containerd.io/restart.status label.

In containerd the label is used as the desiredStatus : https://github.com/containerd/containerd/blob/main/runtime/restart/monitor/monitor.go#L152

After Fixed:

#  ./_output/nerdctl create --restart=always docker.m.daocloud.io/nginx
c59503699e2319491f398669a47697ead68ac081ee44afd431f7a684cc3221c1
#  ./_output/nerdctl run -d --restart=always docker.m.daocloud.io/nginx
fb95a1146e94d47b6441da6082b530b7d639d713e8c7d067e20cf4a6e2b7384f
# ./_output/nerdctl ps -a |grep nginx
c59503699e23    docker.m.daocloud.io/nginx:latest                             "/docker-entrypoint.…"    17 seconds ago    Created             nginx-c5950
fb95a1146e94    docker.m.daocloud.io/nginx:latest                             "/docker-entrypoint.…"    17 seconds ago    Up                  nginx-fb95

The container would not start after being created with the restart policy. The behavior is consistent with docker

[AkihiroSuda]

Thanks

[yankay]

Thank you @AkihiroSuda for the PR review