Function polkadot_node_subsystem_util::runtime::get_validation_code_by_hash

pub async fn get_validation_code_by_hash<Sender>(
    sender: &mut Sender,
    relay_parent: Hash,
    validation_code_hash: ValidationCodeHash,
) -> Result<Option<ValidationCode>, Error>
where
    Sender: SubsystemSender<RuntimeApiMessage>,

Fetch ValidationCode by hash from the runtime.