[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/rococo/src/lib.rs

@@ -1662,6 +1662,9 @@ pub mod migrations {
 		parachains_configuration::migration::v11::MigrateToV11<Runtime>,
 		// This needs to come after the `parachains_configuration` above as we are reading the configuration.
 		coretime::migration::MigrateToCoretime<Runtime, crate::xcm_config::XcmRouter, GetLegacyLeaseImpl>,
+
+		// permanent
+		pallet_xcm::migration::MigrateToLatestXcmVersion<Runtime>,
 	);
 }