cumulus test runtime: remove GenesisExt (#2147)

This PR removes the `GenesisExt` wrapper over the `GenesisRuntimeConfig`
in `cumulus-test-service`. Initialization of values that were performed
by `GenesisExt::BuildStorage` was moved into `test_pallet` genesis.

---------

Co-authored-by: command-bot <>
Co-authored-by: Bastian Köcher <git@kchr.de>

cumulus/test/runtime/src/lib.rs

@@ -76,10 +76,6 @@ impl_opaque_keys! {
 	pub struct SessionKeys {}
 }
 
-/// Some key that we set in genesis and only read in [`TestOnRuntimeUpgrade`] to ensure that
-/// [`OnRuntimeUpgrade`] works as expected.
-pub const TEST_RUNTIME_UPGRADE_KEY: &[u8] = b"+test_runtime_upgrade_key+";
-
 /// The para-id used in this runtime.
 pub const PARACHAIN_ID: u32 = 100;
 
@@ -293,6 +289,7 @@ impl cumulus_pallet_parachain_system::Config for Runtime {
 }
 
 parameter_types! {
+	// will be set by test_pallet during genesis init
 	pub storage ParachainId: cumulus_primitives_core::ParaId = PARACHAIN_ID.into();
 }
 
@@ -367,7 +364,10 @@ pub struct TestOnRuntimeUpgrade;
 
 impl OnRuntimeUpgrade for TestOnRuntimeUpgrade {
 	fn on_runtime_upgrade() -> frame_support::weights::Weight {
-		assert_eq!(sp_io::storage::get(TEST_RUNTIME_UPGRADE_KEY), Some(vec![1, 2, 3, 4].into()));
+		assert_eq!(
+			sp_io::storage::get(test_pallet::TEST_RUNTIME_UPGRADE_KEY),
+			Some(vec![1, 2, 3, 4].into())
+		);
 		Weight::from_parts(1, 0)
 	}
 }