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/tx-pause/src/mock.rs

@@ -23,7 +23,7 @@ use super::*;
 use crate as pallet_tx_pause;
 
 use frame_support::{
-	parameter_types,
+	derive_impl, parameter_types,
 	traits::{ConstU64, Everything, InsideBoth, InstanceFilter},
 };
 use frame_system::EnsureSignedBy;
@@ -36,6 +36,7 @@ use sp_runtime::{
 parameter_types! {
 	pub const BlockHashCount: u64 = 250;
 }
+#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig)]
 impl frame_system::Config for Test {
 	type BaseCallFilter = InsideBoth<Everything, TxPause>;
 	type BlockWeights = ();