non-admin user is not warned if they attempt to access a forbidden page

[kayra1]

Describe the bug

If the logged in user is not an admin, we currently disable the tab that directs to users. However, if the user manually enters the /users path in the url, they will not be warned that they are attempting to access anything, they will see a very long loading screen.

To Reproduce

deploy notary
create a new user
log in as that user
type <url>/users into the url bar in your browser

Expected behavior

A 403 forbidden page should be shown if the request fails with a 403