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/root-offences/src/mock.rs

@@ -23,7 +23,7 @@ use frame_election_provider_support::{
 	onchain, SequentialPhragmen,
 };
 use frame_support::{
-	parameter_types,
+	derive_impl, parameter_types,
 	traits::{ConstU32, ConstU64, Hooks, OneSessionHandler},
 };
 use pallet_staking::StakerStatus;
@@ -84,6 +84,7 @@ impl sp_runtime::BoundToRuntimeAppPublic for OtherSessionHandler {
 	type Public = UintAuthorityId;
 }
 
+#[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 = ();