[pallet_xcm] Forgotten migration to XCMv4 + added try-state to the pallet_xcm (#3228)

Relates to: https://github.com/paritytech/polkadot-sdk/issues/3214

## TODO

- [ ] backport to the `1.7.0` release

polkadot/runtime/westend/src/lib.rs

@@ -1656,6 +1656,8 @@ pub mod migrations {
 		// Migrate Identity pallet for Usernames
 		pallet_identity::migration::versioned::V0ToV1<Runtime, IDENTITY_MIGRATION_KEY_LIMIT>,
 		parachains_configuration::migration::v11::MigrateToV11<Runtime>,
+		// permanent
+		pallet_xcm::migration::MigrateToLatestXcmVersion<Runtime>,
 	);
 }