make sure parse_recipe_yaml is called with cbc_path

[minrk]

Description:

it's frequently required to parse recipes (v1 at least) with cbc config, either from the recipe or .ci_support.

I only found one ci_support record in feedstock_attrs, so use that. I'm not sure if there's a better value to use or a better way to find the key? I could only find "the first one that starts with ci_support".

Fixes, for example,

create_migration_yaml_creator(migrators, gx, pin_to_debug="mpich")

Checklist:

• Pydantic model updated or no update needed

Cross-refs, links to issues, etc:

closes #5607

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 79.78%. Comparing base (6fc17ea) to head (960bdf6).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
conda_forge_tick/make_migrators.py	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5610      +/-   ##
==========================================
+ Coverage   79.74%   79.78%   +0.03%     
==========================================
  Files         144      144              
  Lines       17006    17018      +12     
==========================================
+ Hits        13562    13577      +15     
+ Misses       3444     3441       -3     

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[minrk]

This appeared to fix the mpich bot PRs: conda-forge/conda-forge-pinning-feedstock#8269