Changes from adding authentication to object-storage-api

[joelvdavies]

Description

Applies same changes made in ral-facilities/object-storage-api#58. Once #377 is done we should be able to remove the outer most conftest.py.

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.87%. Comparing base (7b89d00) to head (a13522a).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #408   +/-   ##
========================================
  Coverage    97.87%   97.87%           
========================================
  Files           41       41           
  Lines         1504     1504           
========================================
  Hits          1472     1472           
  Misses          32       32           

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