assets/admin/origin-save: Enable to add note when rejecting a request
In the save code now administation page, display a new modal when
rejecting a save request enabling to add a rejection note through
the use of a text area.
Default behavior is to enter a custom note but a couple of prefilled
rejection notes can be selected for the following cases:
- the origin URL is not a repository link
- the visit type for the origin URL is not valid
- the origin URL cannot be found