Waffles Part 2: Move waffle switches to django-waffle 🧇

[robhudson]

One-line summary

See #15195 for Part 1.

This is Part 2 after Part 1 is deployed and the import has been run.

• I used an AI to write some of this code.

Significant changes and points to review

Issue / Bugzilla link

#15157

Testing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.41%. Comparing base (009357a) to head (2c31e4e).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15229      +/-   ##
==========================================
+ Coverage   77.77%   78.41%   +0.64%     
==========================================
  Files         164      162       -2     
  Lines        8462     8350     -112     
==========================================
- Hits         6581     6548      -33     
+ Misses       1881     1802      -79     

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[robhudson]

@stevejalim, @pmac Flagged for review, but probably best to review by commit since this branch is based on the part-1 branch. So you'll see both in the "Files changed" view.

[pmac]

🧇

[pmac]

r+wc