fix: Use Django Collate() when listing all ADs

[evyncke]

To address #11167 (on production DT, "Éric" does not appear between "Deb" and "Gorry" but is listed at the end), there are TWO ways:

1. change the production Postgres collation to support en_US.utf8 (like in the Docker Postgres DB)
2. apply this PR

Really unsure what is the best way forward.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.63%. Comparing base (b5b78cd) to head (3491ebf).
⚠️ Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11234      +/-   ##
==========================================
+ Coverage   88.58%   88.63%   +0.04%     
==========================================
  Files         333      333              
  Lines       44728    44817      +89     
==========================================
+ Hits        39624    39723      +99     
+ Misses       5104     5094      -10     

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[jennifer-richards]

Seems reasonable to me until we can fix this more cleanly. I'll create an issue for it.