feat: print the bad attr we find for debugging purposes

[beckermr]

Description:

Checklist:

• Pydantic model updated or no update needed

Cross-refs, links to issues, etc:

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.47%. Comparing base (e0050cb) to head (80e2d7f).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
conda_forge_tick/migrators/core.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2966   +/-   ##
=======================================
  Coverage   77.47%   77.47%           
=======================================
  Files         115      115           
  Lines       12215    12215           
=======================================
  Hits         9463     9463           
  Misses       2752     2752           

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