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/purchase.rs

@@ -484,7 +484,7 @@ mod tests {
 	// or public keys. `u64` is used as the `AccountId` and no `Signature`s are required.
 	use crate::purchase;
 	use frame_support::{
-		assert_noop, assert_ok, ord_parameter_types, parameter_types,
+		assert_noop, assert_ok, derive_impl, ord_parameter_types, parameter_types,
 		traits::{Currency, WithdrawReasons},
 	};
 	use sp_runtime::{
@@ -511,6 +511,8 @@ mod tests {
 	parameter_types! {
 		pub const BlockHashCount: u32 = 250;
 	}
+
+	#[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 = ();