Replace pytest-arraydiff with regression data style

[andrewfullard]

📝 Description

Type: 🚦 testing

pytest-arraydiff is not really supported and makes tests harder to read. Replacing it with the TARDIS regression data makes both codes consistent.

🚦 Testing

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☑️ Checklist

• I requested two reviewers for this pull request
• I updated the documentation according to my changes
• I built the documentation by applying the build_docs label

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.87%. Comparing base (fc47fbd) to head (bdf889d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #398   +/-   ##
=======================================
  Coverage   68.87%   68.87%           
=======================================
  Files          31       31           
  Lines        3733     3733           
=======================================
  Hits         2571     2571           
  Misses       1162     1162           

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[andrewfullard]

This should probably wait until the environment change