bug/LBGG-590: Persistent login

[erunks]

What

Enables persistent logins across multiple tabs and windows by storing session data in a cookie

Changes

• Use a cookie to store the
  • current user.
  • session token.
• Mocked useCookie out in the tests

Link to Issue

Closes https://github.com/leaderboardsgg/leaderboard-site/issues/590

Acceptance

Steps for testing

• [ ] Log in to an account
• [ ] Open a new tab
• [ ] Verify you are still logged in

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