persisted_validation_data: RuntimeDescriptor<[para_id: number, assumption: OccupiedCoreAssumption], {
    max_pov_size: number;
    parent_head: Binary;
    relay_parent_number: number;
    relay_parent_storage_root: FixedSizeBinary<32>;
} | undefined>

Yields the persisted validation data for the given ParaId along with an assumption that should be used if the para currently occupies a core.

Returns None if either the para is not registered or the assumption is Freed and the para already occupies a core.