DM-47482: Remove explicit garbage collection

[andy-slac]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.73%. Comparing base (3abcffb) to head (c19694b).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #312      +/-   ##
==========================================
- Coverage   89.73%   89.73%   -0.01%     
==========================================
  Files          50       50              
  Lines        4522     4520       -2     
  Branches      414      414              
==========================================
- Hits         4058     4056       -2     
  Misses        340      340              
  Partials      124      124              

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