Coretime Zombienet test (#2867)

This adds a Zombienet test for Coretime.

Requires: https://github.com/paritytech/polkadot-sdk/pull/2862

---------

Co-authored-by: Javier Viola <javier@parity.io>
Co-authored-by: Javier Viola <363911+pepoviola@users.noreply.github.com>

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

@@ -27,7 +27,8 @@ use pallet_broker::{CoreAssignment, CoreIndex as BrokerCoreIndex};
 use primitives::{CoreIndex, Id as ParaId};
 use sp_arithmetic::traits::SaturatedConversion;
 use xcm::v3::{
-	send_xcm, Instruction, Junction, Junctions, MultiLocation, OriginKind, SendXcm, Xcm,
+	send_xcm, Instruction, Junction, Junctions, MultiLocation, OriginKind, SendXcm, WeightLimit,
+	Xcm,
 };
 
 use crate::{
@@ -220,9 +221,13 @@ impl<T: Config> Pallet<T> {
 		let new_core_count = notification.new_config.coretime_cores;
 		if new_core_count != old_core_count {
 			let core_count: u16 = new_core_count.saturated_into();
-			let message = Xcm(vec![mk_coretime_call(
-				crate::coretime::CoretimeCalls::NotifyCoreCount(core_count),
-			)]);
+			let message = Xcm(vec![
+				Instruction::UnpaidExecution {
+					weight_limit: WeightLimit::Unlimited,
+					check_origin: None,
+				},
+				mk_coretime_call(crate::coretime::CoretimeCalls::NotifyCoreCount(core_count)),
+			]);
 			if let Err(err) = send_xcm::<T::SendXcm>(
 				MultiLocation {
 					parents: 0,
@@ -247,7 +252,7 @@ fn mk_coretime_call(call: crate::coretime::CoretimeCalls) -> Instruction<()> {
 		origin_kind: OriginKind::Superuser,
 		// Largest call is set_lease with 1526 byte:
 		// Longest call is reserve() with 31_000_000
-		require_weight_at_most: Weight::from_parts(100_000_000, 20_000),
+		require_weight_at_most: Weight::from_parts(110_000_000, 20_000),
 		call: BrokerRuntimePallets::Broker(call).encode().into(),
 	}
 }