Implement base authorisation #1472

[MatteoGuarnaccia5]

Description

Based off original issue #1472, admin functionality is added via parseToken.ts , which will return if the current user's token has any role that is also a part of the configured privilegedRoles . If the user does have a privileged status, they will be able to edit/create units/usage statuses (completed in this PR), bypass rules (to be done #1523 ), and an alert with their role will appear in the top right of the website.

The /admin route, along with component and filenames have been renamed to be /settings , Settings etc

Please note:
This PR is dependent on ral-facilities/ldap-jwt-auth#271 in ldap-jwt-auth, and should be merged in conjunction with it, to avoid breaking changes.

This PR adds a new key/value pair to the inventory-management-system-settings.json , this change should also be made in scigateway for production.

Testing instructions

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

Agile board tracking

connect to #1472

[codecov]

Codecov Report

❌ Patch coverage is 99.26740% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.82%. Comparing base (678342f) to head (31f1ab9).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/parseTokens.ts	75.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1596      +/-   ##
===========================================
- Coverage    98.82%   98.82%   -0.01%     
===========================================
  Files          111      114       +3     
  Lines        21769    21920     +151     
  Branches      2501     2512      +11     
===========================================
+ Hits         21514    21663     +149     
- Misses         254      256       +2     
  Partials         1        1              

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