Remove dummy migration file

[SchrodingersGat]

• Remove dummy migration file created during unit tests
• Ref: https://github.com/inventree/InvenTree/issues/6394

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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 :warning:

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/inventree/InvenTree/pull/8537/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree) | Coverage Δ | | |---|---|---| | [backend](https://app.codecov.io/gh/inventree/InvenTree/pull/8537/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree) | `85.94% <71.42%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree#carryforward-flags-in-the-pull-request-comment) to find out more.

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