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/referenda/src/mock.rs

@@ -21,7 +21,7 @@ use super::*;
 use crate as pallet_referenda;
 use codec::{Decode, Encode, MaxEncodedLen};
 use frame_support::{
-	assert_ok, ord_parameter_types, parameter_types,
+	assert_ok, derive_impl, ord_parameter_types, parameter_types,
 	traits::{
 		ConstU32, ConstU64, Contains, EqualPrivilegeOnly, OnInitialize, OriginTrait, Polling,
 		SortedMembers,
@@ -59,6 +59,7 @@ impl Contains<RuntimeCall> for BaseFilter {
 parameter_types! {
 	pub MaxWeight: Weight = Weight::from_parts(2_000_000_000_000, u64::MAX);
 }
+#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig)]
 impl frame_system::Config for Test {
 	type BaseCallFilter = BaseFilter;
 	type BlockWeights = ();