2659: (1) Update link_to_if_arvados_object method to display an object name as link...

2659: (1) Update link_to_if_arvados_object method to display an object name as link for User type only when the user is active.
Otherwise, an anonymous user will always see 404 when such a link is clicked.
(2) In the unlikely event of an anonymous user traversing to /users or /groups pages, there will be an 'Add a new xxx' link,
which is undesirable (even though they do eventually fail when accessed). Hence, hide them for inactive users.
(3) Add test assertions for both the updates.