Meets #7515: Copy/Move does not update available statuses

[``* `#7515` Copy/Move does not update available statuses``](https://www.openproject.org/work_packages/7515)
Why aren't you reusing the #new action and alter it to also work correctly with the types? AFAIK, when updating the project, it is already called, so it makes more sense to me to also reuse it for updating a type. Maybe the updating the statuses functionality can be moved completely to the prepare_for_work_package_move function.