Shelve Project causes jobs to be updated twice

The Shelve project plugin enforce a property whenever an item is Updated as well as when all items have been Loaded

This is inefficient. It also impacts other functionalities/plugins. For example the Job Config History plugin - which implements SaveableListener - will add 2 entries when you save a job because every time a job is saved, the Shelve Plugin update it to enforce the ShelveProjectProperty.