Function polkadot_node_subsystem_util::request_candidate_pending_availability

pub async fn request_candidate_pending_availability(
    parent: Hash,
    para_id: ParaId,
    sender: &mut impl SubsystemSender<RuntimeApiMessage>
) -> RuntimeApiReceiver<Option<CommittedCandidateReceipt>>

Request CandidatePendingAvailability from the runtime