LIVEOAK-449: Enhance security pages workflow

* Different messages depending on existing storage resource and collections;
* Add ability to add a collection from security policies page when there are storage resources but no collections;
* After successfully adding collection, the user is sent to the page to secure the new collection;
* When securing a collection and a new role is added, it is automatically selected;
* Add ability to add a collection from securing collection screen, selecting it in the dropdown;