Reduce size of mock generated data #392

[joelvdavies]

Description

Adjusts the generate_mock_data script to generate less data overall by fixing a bug with system generation producing subsystems down though MAX_LEVELS_DEEP + 1 and reducing some of the constants . See the screenshots below.
Old:

New:

This makes it considerably faster and should make it quicker to populate mock data for the object_storage_api. This PR also makes some modifications in line with ral-facilities/object-storage-api#43.

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

Closes #392

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.87%. Comparing base (5931ed9) to head (11f588f).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #397   +/-   ##
========================================
  Coverage    97.87%   97.87%           
========================================
  Files           41       41           
  Lines         1504     1504           
========================================
  Hits          1472     1472           
  Misses          32       32           

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