Remove dummy migration file

[SchrodingersGat]

• Remove dummy migration file created during unit tests
• Ref: Strange Migration during CI #6394

[netlify]

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Name	Link
🔨 Latest commit	e79a0f9
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[matmair]

lgtm

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.61%. Comparing base (94089c9) to head (e79a0f9).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/backend/InvenTree/InvenTree/test_tasks.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8537      +/-   ##
==========================================
- Coverage   84.61%   84.61%   -0.01%     
==========================================
  Files        1178     1178              
  Lines       53634    53641       +7     
  Branches     2026     2026              
==========================================
+ Hits        45382    45386       +4     
- Misses       7728     7731       +3     
  Partials      524      524              

Flag	Coverage Δ
backend	85.94% <71.42%> (-0.01%)	⬇️

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