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>

polkadot/runtime/common/src/impls.rs

@@ -192,6 +192,7 @@ pub mod benchmarks {
 mod tests {
 	use super::*;
 	use frame_support::{
+		derive_impl,
 		dispatch::DispatchClass,
 		parameter_types,
 		traits::{
@@ -237,6 +238,7 @@ mod tests {
 		pub const AvailableBlockRatio: Perbill = Perbill::one();
 	}
 
+	#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig)]
 	impl frame_system::Config for Test {
 		type BaseCallFilter = frame_support::traits::Everything;
 		type RuntimeOrigin = RuntimeOrigin;