Remove TransientValidationData (#2272)

* collation-generation: use persisted validation data

* node: remote FullValidationData API

* runtime: remove FullValidationData API

* backing tests: use persisted validation data

* FullCandidateReceipt: use persisted validation data

This is not a big change since this type is not used anywhere

* Remove ValidationData and TransientValidationData

Also update the guide

polkadot/node/subsystem/src/messages.rs

@@ -36,7 +36,7 @@ use polkadot_primitives::v1::{
 	CollatorId, CommittedCandidateReceipt, CoreState, ErasureChunk,
 	GroupRotationInfo, Hash, Id as ParaId, OccupiedCoreAssumption,
 	PersistedValidationData, PoV, SessionIndex, SignedAvailabilityBitfield,
-	ValidationCode, ValidatorId, ValidationData, CandidateHash,
+	ValidationCode, ValidatorId, CandidateHash,
 	ValidatorIndex, ValidatorSignature, InboundDownwardMessage, InboundHrmpMessage,
 };
 use std::{sync::Arc, collections::btree_map::BTreeMap};
@@ -412,14 +412,6 @@ pub enum RuntimeApiRequest {
 		OccupiedCoreAssumption,
 		RuntimeApiSender<Option<PersistedValidationData>>,
 	),
-	/// Get the full validation data for a particular para, taking the given
-	/// `OccupiedCoreAssumption`, which will inform on how the validation data should be computed
-	/// if the para currently occupies a core.
-	FullValidationData(
-		ParaId,
-		OccupiedCoreAssumption,
-		RuntimeApiSender<Option<ValidationData>>,
-	),
 	/// Sends back `true` if the validation outputs pass all acceptance criteria checks.
 	CheckValidationOutputs(
 		ParaId,