Move SQL queries out of the api layer

[oliver3]

Even though it was used in the tests, there shouldn't be any SQL queries outside of the repository layer.

• test_create_data_entry_uniqueness() now uses a new #[cfg(test)] get_polling_station_data_entries()
• test_first_entry_finalise_with_errors() uses the existing audit_log::list_all() which has been changed to have a more intuitive ordering

[github-actions]

Sigrid maintainability feedback

💭️ You did not change any files that are analyzed by Sigrid.

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[github-actions]

PDF Diff Summary

Comparing against base branch: main

File	Status
model-n-10-2.pdf	✅ No changes
model-na-14-2-bijlage1.pdf	✅ No changes
model-na-14-2.pdf	✅ No changes
model-na-31-2-bijlage1.pdf	✅ No changes
model-na-31-2-inlegvel.pdf	✅ No changes
model-na-31-2.pdf	✅ No changes
model-p-2a.pdf	✅ No changes

[Lionqueen94]

Looks good to me

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.36%. Comparing base (ee1c92c) to head (a7e6273).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2863      +/-   ##
==========================================
- Coverage   91.37%   91.36%   -0.01%     
==========================================
  Files         379      379              
  Lines       17639    17659      +20     
  Branches     1987     1987              
==========================================
+ Hits        16117    16135      +18     
- Misses       1424     1425       +1     
- Partials       98       99       +1     

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