[refactor] File uploads

[SchrodingersGat]

This PR refactors how file uploads are handled:

• Single file upload path renamer
• Keep files associated with their model type
• Optionally associate files with their underlying model ID

In addition to reducing duplicated code (and potential bugs) - this PR can be used in the future to implement an auth check of uploaded files - and reject if the user does not have the required permissions to access those files. We can use the file path to determine the model type (and potentially ID) and then check if the user has the correct roles/permissions.

Tasks

• Refactor existing upload_to endpoints
• Fix bugs
• Add unit testing for all potential upload points
• Data migrations for moving existing uploaded files

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[codecov]

Codecov Report

❌ Patch coverage is 92.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.59%. Comparing base (b63d829) to head (c23d16f).
⚠️ Report is 2 commits behind head on master.

❌ Your patch check has failed because the patch coverage (94.11%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12322      +/-   ##
==========================================
+ Coverage   83.20%   86.59%   +3.39%     
==========================================
  Files        1393     1397       +4     
  Lines       91285    91509     +224     
  Branches    10588    10468     -120     
==========================================
+ Hits        75950    79246    +3296     
+ Misses      15270    12201    -3069     
+ Partials       65       62       -3     

Flag	Coverage Δ
backend	90.63% <92.00%> (-0.10%)	⬇️

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Components	Coverage Δ
Backend Apps	92.16% <91.30%> (-0.11%)	⬇️
Backend General	93.00% <94.11%> (-0.36%)	⬇️
Frontend	79.53% <ø> (+8.41%)	⬆️

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