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 https://github.com/ral-facilities/object-storage-api/pull/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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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