chore: remove unused variables

[jennifer-richards]

These variables date back to at least 2013 and don't show up anywhere else that I can find.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.90%. Comparing base (8fbbc55) to head (493e5e0).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9742      +/-   ##
==========================================
+ Coverage   88.87%   88.90%   +0.02%     
==========================================
  Files         319      316       -3     
  Lines       41925    41994      +69     
==========================================
+ Hits        37260    37333      +73     
+ Misses       4665     4661       -4     

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