[containerd-snapshotter] add support to prune build cache type=regular

[long76]

Description

do:

1. docker build
2. docker system prune --all --volumes
3. docker buildx prune -a -f
4. docker system df -v

still show build cache with cache type=regular

/etc/docker/daemon.json

{
  "data-root": "/mnt/other_disk/docker_store",
  "default-address-pools": [
    {
      "base": "100.100.0.0/12",
      "size": 16
    }
  ],
  "features": {
    "containerd-snapshotter": true
  }
}

/etc/containerd/config.toml

disabled_plugins = ["cri"]
root = "/mnt/other_disk/containerd-data"