Moves all test runtimes to use derive_impl (#2409)

Step in https://github.com/paritytech/polkadot-sdk/issues/171

This PR adds `derive_impl` on all `frame_system` config impls for mock
runtimes. The overridden configs are maintained as of now to ensure
minimal changes.

---------

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

substrate/frame/system/benches/bench.rs

@@ -16,7 +16,10 @@
 // limitations under the License.
 
 use criterion::{black_box, criterion_group, criterion_main, Criterion};
-use frame_support::traits::{ConstU32, ConstU64};
+use frame_support::{
+	derive_impl,
+	traits::{ConstU32, ConstU64},
+};
 use sp_core::H256;
 use sp_runtime::{
 	traits::{BlakeTwo256, IdentityLookup},
@@ -57,6 +60,8 @@ frame_support::parameter_types! {
 			4 * 1024 * 1024, Perbill::from_percent(75),
 		);
 }
+
+#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig)]
 impl frame_system::Config for Runtime {
 	type BaseCallFilter = frame_support::traits::Everything;
 	type BlockWeights = ();

substrate/frame/system/benchmarking/src/mock.rs

@@ -20,6 +20,7 @@
 #![cfg(test)]
 
 use codec::Encode;
+use frame_support::derive_impl;
 use sp_runtime::{traits::IdentityLookup, BuildStorage};
 
 type AccountId = u64;
@@ -34,6 +35,7 @@ frame_support::construct_runtime!(
 	}
 );
 
+#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig)]
 impl frame_system::Config for Test {
 	type BaseCallFilter = frame_support::traits::Everything;
 	type BlockWeights = ();