[2.x] Fix factory suppositions

[r-kujawa]

What does this PR do? 🤖

Removes all model overriding capabilities from factories.

Any background context you would like to provide? 🚧

Factories are not intended to be extended to the end user if they wish to override their models. They should also choose to override their factories.

Does this relate to any issue? 🔗

Closes #59

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.69%. Comparing base (0972ae9) to head (928f9fe).

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #60      +/-   ##
============================================
- Coverage     63.03%   61.69%   -1.35%     
+ Complexity       90       87       -3     
============================================
  Files            18       18              
  Lines           211      201      -10     
============================================
- Hits            133      124       -9     
+ Misses           78       77       -1     

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