Filter votes from disabled validators in BackedCandidates in process_inherent_data (#2889)

Backport of https://github.com/paritytech/polkadot-sdk/pull/1863 to
master

Extend candidate sanitation in paras_inherent by removing backing votes
from disabled validators. Check
https://github.com/paritytech/polkadot-sdk/issues/1592 for more details.

This change is related to the disabling strategy implementation
(https://github.com/paritytech/polkadot-sdk/pull/2226).

---------

Co-authored-by: ordian <noreply@reusable.software>
Co-authored-by: ordian <write@reusable.software>
Co-authored-by: Maciej <maciej.zyszkiewicz@parity.io>

substrate/frame/aura/src/mock.rs

@@ -96,6 +96,10 @@ impl DisabledValidators for MockDisabledValidators {
 	fn is_disabled(index: AuthorityIndex) -> bool {
 		DisabledValidatorTestValue::get().binary_search(&index).is_ok()
 	}
+
+	fn disabled_validators() -> Vec<u32> {
+		DisabledValidatorTestValue::get()
+	}
 }
 
 impl pallet_aura::Config for Test {

substrate/frame/contracts/mock-network/src/relay_chain.rs

@@ -99,7 +99,9 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 }
 
-impl shared::Config for Runtime {}
+impl shared::Config for Runtime {
+	type DisabledValidators = ();
+}
 
 impl configuration::Config for Runtime {
 	type WeightInfo = configuration::TestWeightInfo;

substrate/frame/session/src/lib.rs

@@ -918,6 +918,10 @@ impl<T: Config> frame_support::traits::DisabledValidators for Pallet<T> {
 	fn is_disabled(index: u32) -> bool {
 		<Pallet<T>>::disabled_validators().binary_search(&index).is_ok()
 	}
+
+	fn disabled_validators() -> Vec<u32> {
+		<Pallet<T>>::disabled_validators()
+	}
 }
 
 /// Wraps the author-scraping logic for consensus engines that can recover

substrate/frame/support/src/traits/validation.rs

@@ -251,10 +251,17 @@ pub trait ValidatorRegistration<ValidatorId> {
 pub trait DisabledValidators {
 	/// Returns true if the given validator is disabled.
 	fn is_disabled(index: u32) -> bool;
+
+	/// Returns all disabled validators
+	fn disabled_validators() -> Vec<u32>;
 }
 
 impl DisabledValidators for () {
 	fn is_disabled(_index: u32) -> bool {
 		false
 	}
+
+	fn disabled_validators() -> Vec<u32> {
+		vec![]
+	}
 }