Disabled validators runtime API (#1257)

Exposes disabled validators list via a runtime API.

---------

Co-authored-by: ordian <noreply@reusable.software>
Co-authored-by: ordian <write@reusable.software>

cumulus/client/relay-chain-minimal-node/src/blockchain_rpc_client.rs

@@ -346,6 +346,13 @@ impl RuntimeApiSubsystemClient for BlockChainRpcClient {
 		Ok(self.rpc_client.parachain_host_minimum_backing_votes(at, session_index).await?)
 	}
 
+	async fn disabled_validators(
+		&self,
+		at: Hash,
+	) -> Result<Vec<polkadot_primitives::ValidatorIndex>, ApiError> {
+		Ok(self.rpc_client.parachain_host_disabled_validators(at).await?)
+	}
+
 	async fn async_backing_params(&self, at: Hash) -> Result<AsyncBackingParams, ApiError> {
 		Ok(self.rpc_client.parachain_host_async_backing_params(at).await?)
 	}

cumulus/client/relay-chain-rpc-interface/src/rpc_client.rs

@@ -597,6 +597,14 @@ impl RelayChainRpcClient {
 			.await
 	}
 
+	pub async fn parachain_host_disabled_validators(
+		&self,
+		at: RelayHash,
+	) -> Result<Vec<ValidatorIndex>, RelayChainError> {
+		self.call_remote_runtime_function("ParachainHost_disabled_validators", at, None::<()>)
+			.await
+	}
+
 	#[allow(missing_docs)]
 	pub async fn parachain_host_async_backing_params(
 		&self,

cumulus/parachains/integration-tests/emulated/common/src/lib.rs

@@ -33,7 +33,7 @@ use xcm_emulator::{
 };
 
 decl_test_relay_chains! {
-	#[api_version(7)]
+	#[api_version(8)]
 	pub struct Westend {
 		genesis = westend::genesis(),
 		on_init = (),
@@ -50,7 +50,7 @@ decl_test_relay_chains! {
 			AssetRate: westend_runtime::AssetRate,
 		}
 	},
-	#[api_version(7)]
+	#[api_version(8)]
 	pub struct Rococo {
 		genesis = rococo::genesis(),
 		on_init = (),
@@ -65,7 +65,7 @@ decl_test_relay_chains! {
 			Balances: rococo_runtime::Balances,
 		}
 	},
-	#[api_version(7)]
+	#[api_version(8)]
 	pub struct Wococo {
 		genesis = rococo::genesis(),
 		on_init = (),