Implement storage- and relationship-aware cleanup

[Swatinem]

This implements a generic mechanism to resolve the model relationship graph based on Django metadata. That graph is then sorted in topological order, and all models are being deleted. Special manual deletion code is written for all the models that have some files in storage, in order to make sure that files are also being cleaned up properly.

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This is work towards codecov/engineering-team#1127

[codecov-notifications]

Codecov Report

Attention: Patch coverage is 35.29412% with 77 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
services/cleanup/models.py	0.00%	56 Missing ⚠️
services/cleanup/cleanup.py	0.00%	16 Missing ⚠️
services/cleanup/relations.py	87.50%	5 Missing ⚠️

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✅ All tests successful. No failed tests were found.

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[codecov]

Codecov Report

Attention: Patch coverage is 35.29412% with 77 lines in your changes missing coverage. Please review.

Project coverage is 97.76%. Comparing base (7b243ab) to head (2dc9ed9).
Report is 6 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
services/cleanup/models.py	0.00%	56 Missing ⚠️
services/cleanup/cleanup.py	0.00%	16 Missing ⚠️
services/cleanup/relations.py	87.50%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #973      +/-   ##
==========================================
- Coverage   97.98%   97.76%   -0.22%     
==========================================
  Files         443      448       +5     
  Lines       35819    35978     +159     
==========================================
+ Hits        35096    35175      +79     
- Misses        723      803      +80     

Flag	Coverage Δ
integration	42.04% <5.88%> (-0.13%)	⬇️
unit	90.43% <35.29%> (-0.20%)	⬇️

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