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/executive/src/lib.rs

@@ -761,7 +761,7 @@ mod tests {
 	};
 
 	use frame_support::{
-		assert_err, parameter_types,
+		assert_err, derive_impl, parameter_types,
 		traits::{fungible, ConstU32, ConstU64, ConstU8, Currency},
 		weights::{ConstantMultiplier, IdentityFee, RuntimeDbWeight, Weight, WeightToFee},
 	};
@@ -917,6 +917,7 @@ mod tests {
 			write: 100,
 		};
 	}
+	#[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 = BlockWeights;