Ensure all StorageVersions on Rococo/Westend are correct and migration hooks pass (#7251)

* set fastunstake storage version

* fix configration migration hooks

* set missing rococo versions

* remove child bounties version set

* future proof this configuration migration

* simplify rococo migration

* simplify westend version migration

* typo

* restore missing comments

* set configuration storage version correctly

* remove redundant preupgrade version check

* fix version checks

* remove redundant comment

polkadot/runtime/westend/src/lib.rs

@@ -1281,6 +1281,8 @@ pub type Migrations =
 /// The runtime migrations per release.
 #[allow(deprecated, missing_docs)]
 pub mod migrations {
+	use frame_support::traits::{GetStorageVersion, OnRuntimeUpgrade, StorageVersion};
+
 	use super::*;
 
 	pub type V0940 = (
@@ -1297,8 +1299,23 @@ pub mod migrations {
 		pallet_offences::migration::v1::MigrateToV1<Runtime>,
 	);
 
+	/// Migrations that set `StorageVersion`s we missed to set.
+	pub struct SetStorageVersions;
+
+	impl OnRuntimeUpgrade for SetStorageVersions {
+		fn on_runtime_upgrade() -> Weight {
+			if FastUnstake::on_chain_storage_version() < 1 {
+				StorageVersion::new(1).put::<FastUnstake>();
+				return RocksDbWeight::get().reads_writes(1, 1)
+			}
+
+			RocksDbWeight::get().reads(1)
+		}
+	}
+
 	/// Unreleased migrations. Add new ones here:
 	pub type Unreleased = (
+		SetStorageVersions,
 		// Remove UMP dispatch queue <https://github.com/paritytech/polkadot/pull/6271>
 		parachains_configuration::migration::v6::MigrateToV6<Runtime>,
 		ump_migrations::UpdateUmpLimits,