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/nomination-pools/test-staking/src/mock.rs

@@ -17,7 +17,7 @@
 
 use frame_election_provider_support::VoteWeight;
 use frame_support::{
-	assert_ok,
+	assert_ok, derive_impl,
 	pallet_prelude::*,
 	parameter_types,
 	traits::{ConstU64, ConstU8},
@@ -38,6 +38,7 @@ pub(crate) type T = Runtime;
 pub(crate) const POOL1_BONDED: AccountId = 20318131474730217858575332831085u128;
 pub(crate) const POOL1_REWARD: AccountId = 20397359637244482196168876781421u128;
 
+#[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 = ();