runtime-rs: fix bugs to support Nydus v5

1. enable virtio-fs-pro in Dragonball to have the ability to process nydus backend registry
2. change passthrough for rw layer's readonly config to false to have the accurate read write ability.

Fixes:#8013

Signed-off-by: Chao Wu <chaowu@linux.alibaba.com>

src/runtime-rs/crates/resource/src/rootfs/nydus_rootfs.rs

@@ -83,7 +83,7 @@ impl NydusRootfs {
                         cid: cid.to_string(),
                         source: extra_options.snapshot_dir.clone(),
                         target: SNAPSHOT_DIR.to_string(),
-                        readonly: true,
+                        readonly: false,
                         is_rafs: false,
                     })
                     .await