Implement authorisation for units #609

[MatteoGuarnaccia5]

Description

This PR implements logic in the unit DELETE and POST endpoints to verify if the user is authorised to perform said operation.
It uses the new JWTBearer functionality from #602

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.

Testing instructions

Add a set up instructions describing how the reviewer should test the code

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

Agile board tracking

connect to #609

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.36%. Comparing base (186167f) to head (b0c3729).

Additional details and impacted files

@@                              Coverage Diff                              @@
##           implement-authorisation-logic-for-rules-#551     #610   +/-   ##
=============================================================================
  Coverage                                         90.36%   90.36%           
=============================================================================
  Files                                                58       58           
  Lines                                              2139     2139           
=============================================================================
  Hits                                               1933     1933           
  Misses                                              206      206           

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