DM-42226: Remove DAF_BUTLER_PLUGINS support

[timj]

Requires lsst/sconsUtils#131

Checklist

• added documentation for a new migration script

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.30%. Comparing base (0ce8b88) to head (99844ec).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #46   +/-   ##
=======================================
  Coverage   59.30%   59.30%           
=======================================
  Files          40       40           
  Lines        1413     1413           
  Branches      165      165           
=======================================
  Hits          838      838           
  Misses        538      538           
  Partials       37       37           

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