chore: Ensure Mixins are ordered according to the MRO

[john-bodley]

SUMMARY

Somewhat of a lazy Friday afternoon PR. Whilst reviewing PRs earlier today I realized there were instances where the class ordering was incorrect, i.e., the following wasn't being adhered to:

Python's Method Resolution Order (MRO) determines how they should be arranged. In a nutshell, mixins come first and base classes come last.

This PR ensures that, per Python's MRO the class inheritance is correctly defined. Potential problematic classes were identified by running git grep Mixin).

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

CI.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8450cca) 69.18% compared to head (44e99e9) 69.18%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #26288   +/-   ##
=======================================
  Coverage   69.18%   69.18%           
=======================================
  Files        1945     1945           
  Lines       75968    75968           
  Branches     8467     8467           
=======================================
  Hits        52557    52557           
  Misses      21224    21224           
  Partials     2187     2187           

Flag	Coverage Δ
hive	53.67% <100.00%> (ø)
mysql	78.08% <100.00%> (ø)
postgres	78.18% <100.00%> (ø)
presto	53.63% <100.00%> (ø)
python	82.86% <100.00%> (ø)
sqlite	76.84% <100.00%> (ø)
unit	55.79% <100.00%> (ø)

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[eschutho]

TIL! LGTM