Migrated linter fix - (Built on django-migrate and NOT main)

[benjmnxu]

Restore backend checks for ohq deployment.

• Black
• Flake
• No Ruff (idk what this is)
• Backend test cases (which we haven't run in like two years lmao)
• No Codecoverage. Uses an outdated django.yaml (We need to add codecoverage token into our secrets)

[judtinzhang]

Thanks for doing this! Can you please take a look at penn-mobile's configs and see if playing with those helps anything (ex. codecov)? Let me know the results!

[benjmnxu]

Main issue with codecov is just the token I believe. Error message on running codecov:

'Unable to locate build via Github Actions API. Please upload with the Codecov repository upload token to resolve issue.'

If the upload token is shared I'll keep looking into it. If it's ohq specific, I'll need to ask Bach or Dan to add it into our secrets

[judtinzhang]

Makes sense, lmk if you stumble into anything else

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.93%. Comparing base (cdc1334) to head (d4af60b).
⚠️ Report is 128 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #312      +/-   ##
==========================================
- Coverage   99.01%   98.93%   -0.08%     
==========================================
  Files          25       25              
  Lines        1316     1316              
==========================================
- Hits         1303     1302       -1     
- Misses         13       14       +1     

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[benjmnxu]

Codecov token added. All tests pass.