nydus-snapshotter uninstalled，containerd config.toml still used nydus，so the node cannot run container again.

[lijianfeng1993]

Failed to create pod sandbox: rpc error: code = Unavailable desc = failed to create containerd container: connection error: desc = "transport: Error while dialing dial unix /run/containerd-nydus/containerd-nydus-grpc.sock: connect: connection refused": unavailable

[imeoer]

cc @adamqqqplay

[adamqqqplay]

@lijianfeng1993 Sorry for the late reply. Maybe we can add a post-delete chart hook to delete related configuration after nydus-snapshotter is uninstalled? Please refer to: https://helm.sh/zh/docs/topics/charts_hooks/