DM-36457: Remove some deprecated code

[timj]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes
• (if changing dimensions.yaml) make a copy of dimensions.yaml in configs/old_dimensions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.40%. Comparing base (427f673) to head (47941f4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1050      +/-   ##
==========================================
+ Coverage   89.37%   89.40%   +0.03%     
==========================================
  Files         360      360              
  Lines       45750    45733      -17     
  Branches     9390     9382       -8     
==========================================
  Hits        40888    40888              
+ Misses       3531     3519      -12     
+ Partials     1331     1326       -5     

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