Prevents errors in tests while using migrations markers

[kingbuzzman]

We were using @pytest.mark.temporary_migration_module(module="....", app_label="app") but failing to use the migration_app_dir in the tests causing issues.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.72%. Comparing base (fb8876c) to head (3fa477a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #71   +/-   ##
=======================================
  Coverage   96.72%   96.72%           
=======================================
  Files          12       12           
  Lines         610      610           
=======================================
  Hits          590      590           
  Misses         20       20           

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