JDBCClusterInvalidator is not used anymore by default since NXP-21801 made repository.clustering.invalidation=pubsub the default (later made non-optional).
—> remove JDBCClusterInvalidator
An important benefit for NXP-28865 is that this class needs a non-transactional access to the connection, which requires a very complex infrastructure in the connection acquisition logic — and we want to remove that.