Switch All construct_runtimes to New Syntax (#2979)

Clean up all the old syntax.

---------

Co-authored-by: command-bot <>
Co-authored-by: gupnik <nikhilgupta.iitk@gmail.com>
Co-authored-by: Nikhil Gupta <17176722+gupnik@users.noreply.github.com>
Co-authored-by: Maksym H <1177472+mordamax@users.noreply.github.com>

substrate/frame/election-provider-multi-phase/src/mock.rs

@@ -54,11 +54,10 @@ pub type UncheckedExtrinsic =
 	sp_runtime::generic::UncheckedExtrinsic<AccountId, RuntimeCall, (), ()>;
 
 frame_support::construct_runtime!(
-	pub struct Runtime
-	{
-		System: frame_system::{Pallet, Call, Event<T>, Config<T>},
-		Balances: pallet_balances::{Pallet, Call, Event<T>, Config<T>},
-		MultiPhase: multi_phase::{Pallet, Call, Event<T>},
+	pub enum Runtime {
+		System: frame_system,
+		Balances: pallet_balances,
+		MultiPhase: multi_phase,
 	}
 );