Implement batch evaluation of RV shapes in get_plates

[elc45]

Description

Finishes up #8033 so to_graphviz can work with pm.CustomDist etc.

Related Issue

• Closes BUG: to_graphviz breaks when the model has a pm.CustomDist #8077
• Related to Implement batch evaluation of RV shapes in get_plates #8033

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

[codecov]

Codecov Report

❌ Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.90%. Comparing base (11d0f1b) to head (4282a8c).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pymc/pytensorf.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8092      +/-   ##
==========================================
+ Coverage   90.89%   90.90%   +0.01%     
==========================================
  Files         123      123              
  Lines       19501    19535      +34     
==========================================
+ Hits        17726    17759      +33     
- Misses       1775     1776       +1     

Files with missing lines	Coverage Δ
pymc/model_graph.py	84.74% <100.00%> (+0.20%)	⬆️
pymc/pytensorf.py	88.13% <90.90%> (+0.01%)	⬆️

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[elc45]

@ricardoV94 any idea why this random test is failing?

[ricardoV94]

Rerunning