feat: Add OGJWTAuthProvider to handle admin users

[joshuadkitenge]

Description

• Implement OGJWTAuthProvider class with isAdmin method to check for admin privileges based on JWT's authorised_routes.
• Add unit tests for isAdmin method covering scenarios with no token, empty authorised_routes, and token containing '/users GET' route.

Testing instructions

• Review code
• Check Actions build
• Review changes to test coverage

Agile board tracking

closes #1423

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.13%. Comparing base (cbfa974) to head (b28085f).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1424      +/-   ##
===========================================
+ Coverage    97.11%   97.13%   +0.01%     
===========================================
  Files           49       50       +1     
  Lines         1802     1814      +12     
  Branches       503      507       +4     
===========================================
+ Hits          1750     1762      +12     
  Misses          48       48              
  Partials         4        4              

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