DM-42091: Remove long deprecated s3 utilities

[timj]

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 86.47%. Comparing base (754fa0f) to head (0cf3e5c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
+ Coverage   86.18%   86.47%   +0.29%     
==========================================
  Files          27       27              
  Lines        4646     4622      -24     
  Branches      956      948       -8     
==========================================
- Hits         4004     3997       -7     
+ Misses        487      470      -17     
  Partials      155      155              

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[timj]

The python 3.13 failure is going to fix itself because 3.13-rc3 has the text added back that was removed in rc2 (and was present in rc1).