Feature/use yaml config#372

[Reillyhewitson]

This PR will close #372

Description

Enter a description of the changes here

Testing Instructions

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

• Review code
• Check GitHub Actions build
• If icatdb Generator Script Consistency Test CI job fails, is this because of a deliberate change made to the script to change generated data (which isn't actually a problem) or is here an underlying issue with the changes made?
• Review changes to test coverage
• Does this change mean a new patch, minor or major version should be made? If so, does one of the commit messages feature fix:, feat: or BREAKING CHANGE: so a release is automatically made via GitHub Actions upon merge?
• {more steps here}

Agile Board Tracking

Connect to #372

[codecov]

Codecov Report

Base: 94.48% // Head: 94.48% // No change to project coverage 👍

Coverage data is based on head (5a63e70) compared to base (57edaaa).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #388   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files          39       39           
  Lines        3118     3118           
  Branches      312      312           
=======================================
  Hits         2946     2946           
  Misses        144      144           
  Partials       28       28           

Impacted Files	Coverage Δ
datagateway_api/src/datagateway_api/backends.py	100.00% <ø> (ø)
...ay_api/src/datagateway_api/query_filter_factory.py	100.00% <ø> (ø)
datagateway_api/src/common/config.py	100.00% <100.00%> (ø)

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[MRichards99]

Looks good, just a couple of picky things that I've picked up on (sorry!).