Finish migration to v2 primitives (#5037)

* remove v0 primitives from polkadot-primitives

* first pass: remove v0

* fix fallout in erasure-coding

* remove v1 primitives, consolidate to v2

* the great import update

* update runtime_api_impl_v1 to v2 as well

* guide: add `Version` request for runtime API

* add version query to runtime API

* reintroduce OldV1SessionInfo in a limited way

polkadot/runtime/parachains/src/paras/mod.rs

@@ -111,12 +111,9 @@ use bitvec::{order::Lsb0 as BitOrderLsb0, vec::BitVec};
 use frame_support::{pallet_prelude::*, traits::EstimateNextSessionRotation};
 use frame_system::pallet_prelude::*;
 use parity_scale_codec::{Decode, Encode};
-use primitives::{
-	v1::{
-		ConsensusLog, HeadData, Id as ParaId, SessionIndex, UpgradeGoAhead, UpgradeRestriction,
-		ValidationCode, ValidationCodeHash, ValidatorSignature,
-	},
-	v2::PvfCheckStatement,
+use primitives::v2::{
+	ConsensusLog, HeadData, Id as ParaId, PvfCheckStatement, SessionIndex, UpgradeGoAhead,
+	UpgradeRestriction, ValidationCode, ValidationCodeHash, ValidatorSignature,
 };
 use scale_info::TypeInfo;
 use sp_core::RuntimeDebug;
@@ -387,7 +384,7 @@ impl<BlockNumber> PvfCheckActiveVoteState<BlockNumber> {
 
 	/// Returns `None` if the quorum is not reached, or the direction of the decision.
 	fn quorum(&self, n_validators: usize) -> Option<PvfCheckOutcome> {
-		let q_threshold = primitives::v1::supermajority_threshold(n_validators);
+		let q_threshold = primitives::v2::supermajority_threshold(n_validators);
 		// NOTE: counting the reject votes is deliberately placed first. This is to err on the safe.
 		if self.votes_reject.count_ones() >= q_threshold {
 			Some(PvfCheckOutcome::Rejected)