Remove already triggered migrations (#2764)

* Remove BabeEpochConfigMigrations

* Remove remaining migrations

* Remove unused migration definitions

polkadot/runtime/kusama/src/lib.rs

@@ -1036,18 +1036,6 @@ impl pallet_babe::migrations::BabePalletPrefix for Runtime {
 	}
 }
 
-pub struct BabeEpochConfigMigrations;
-impl frame_support::traits::OnRuntimeUpgrade for BabeEpochConfigMigrations {
-	fn on_runtime_upgrade() -> frame_support::weights::Weight {
-		pallet_babe::migrations::add_epoch_configuration::<Runtime>(
-			babe_primitives::BabeEpochConfiguration {
-				allowed_slots: babe_primitives::AllowedSlots::PrimaryAndSecondaryPlainSlots,
-				..BABE_GENESIS_EPOCH_CONFIG
-			}
-		)
-	}
-}
-
 /// The address format for describing accounts.
 pub type Address = sp_runtime::MultiAddress<AccountId, ()>;
 /// Block header type as expected by this runtime.
@@ -1079,24 +1067,11 @@ pub type Executive = frame_executive::Executive<
 	frame_system::ChainContext<Runtime>,
 	Runtime,
 	AllPallets,
-	(BabeEpochConfigMigrations, KillOffchainPhragmenStorageTest),
+	(),
 >;
 /// The payload being signed in the transactions.
 pub type SignedPayload = generic::SignedPayload<Call, SignedExtra>;
 
-/// This is only for testing. The main migration is inside staking's `on_runtime_upgrade`.
-pub struct KillOffchainPhragmenStorageTest;
-impl frame_support::traits::OnRuntimeUpgrade for KillOffchainPhragmenStorageTest {
-	#[cfg(feature = "try-runtime")]
-	fn pre_upgrade() -> Result<(), &'static str> {
-		pallet_staking::migrations::v6::pre_migrate::<Runtime>()
-	}
-
-	fn on_runtime_upgrade() -> frame_support::weights::Weight {
-		0
-	}
-}
-
 #[cfg(not(feature = "disable-runtime-api"))]
 sp_api::impl_runtime_apis! {
 	impl sp_api::Core<Block> for Runtime {