fix: add authorization for UI routes

[jescalada]

Fixes #918.

This PR fixes the UI route access issue (unlogged users and non-admins can no longer access any route). In other words, only admins should be able to access the list of users, and only logged-in users can see the rest. Unlogged users can only access the login page.

You'll see an Unauthorized page when accessing a route you don't have access to.

Another issue we'd like to fix is the layout and the admin routes, which are coupled. Thus, all routes are called /admin/* when we only want the actual admin routes to have this naming (and replace regular routes with /dashboard/). To keep things bite-sized, this will be pushed in a separate PR.

It builds on top of the OIDC implementation at #905. As mentioned in that PR, testing with OIDC will require editing the config.

Tests will be modified/added in the layout fix PR since the routes will change.

Thank you!

Changelog

• Added AuthProvider
  • To provide context with the current user
• Added PrivateRoute
  • A wrapper that handles route authorization/redirection
• Added NotAuthorized and NotFound pages
  • To prevent showing blank pages or redirecting (which is confusing)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: jescalada / name: Juan Escalada (fb1a711, d049463, f2c1182, 47e95d4, 893e0b1, 516ed7f, 0a1c6c2, 256523f, 9e245c1, 9e4b9aa, 0c6844f, 12dbbfa)
• ✅ login: JamieSlome / name: Jamie Slome (97d3157)

[netlify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.88%. Comparing base (585cda6) to head (9e245c1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #917   +/-   ##
=======================================
  Coverage   61.88%   61.88%           
=======================================
  Files          49       49           
  Lines        1805     1805           
=======================================
  Hits         1117     1117           
  Misses        688      688           

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