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/identity/src/tests.rs

@@ -25,7 +25,7 @@ use crate::{
 
 use codec::{Decode, Encode};
 use frame_support::{
-	assert_noop, assert_ok, ord_parameter_types, parameter_types,
+	assert_noop, assert_ok, derive_impl, ord_parameter_types, parameter_types,
 	traits::{ConstU32, ConstU64, EitherOfDiverse, Get},
 	BoundedVec,
 };
@@ -47,6 +47,7 @@ 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 = ();