Function make_valid_candidate_descriptor_v3 

pub fn make_valid_candidate_descriptor_v3<H: AsRef<[u8]> + Copy + Default>(
    para_id: Id,
    relay_parent: H,
    core_index: CoreIndex,
    session_index: SessionIndex,
    scheduling_session_index: SessionIndex,
    persisted_validation_data_hash: Hash,
    pov_hash: Hash,
    validation_code_hash: impl Into<ValidationCodeHash>,
    para_head: Hash,
    erasure_root: Hash,
    scheduling_parent: H,
) -> CandidateDescriptorV2<H>

Create a v3 candidate descriptor with explicit scheduling_parent.

V3 descriptors are identified by version=1 and have a non-zero scheduling_parent field. V3 candidates require UMP signals to be present.