WIP: Hide private token by default

What does this MR do?

Only show the user's private token after they enter their password.

Are there points in the code the reviewer needs to double check?

@rspeicher has taken a look at the backend, so the frontend 🙂

Why was this MR needed?

It's better to require confirmation that this actually the user before displaying the token: for instance, in the case of an XSS vulnerability.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together