async fn validate_integrity(
object_ids: HashSet<HummockRawObjectId>,
hummock_storage_url: &str,
hummock_storage_directory: &str,
) -> BackupResult<()>async fn validate_integrity(
object_ids: HashSet<HummockRawObjectId>,
hummock_storage_url: &str,
hummock_storage_directory: &str,
) -> BackupResult<()>