feat: remove build to python-build migration

[beckermr]

Description:

This PR removes the build to python-build migrator per conda-forge/conda-forge.github.io#2269.

Checklist:

• Pydantic model updated or no update needed

Cross-refs, links to issues, etc:

xref: conda-forge/conda-forge.github.io#2269

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.46%. Comparing base (ddbdff0) to head (26a941b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2943      +/-   ##
==========================================
- Coverage   77.49%   77.46%   -0.03%     
==========================================
  Files         115      115              
  Lines       12215    12214       -1     
==========================================
- Hits         9466     9462       -4     
- Misses       2749     2752       +3     

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