Include Op in message when raising NotImplementedError from grad

[Aarsh-Wankar]

Added an error message f"grad not implemented for Op {self}" in the NotImplementedError for the grad function of Op class.

Description

This change helps in finding the Op which has an unimplemented grad when many Ops are strung together.

Related Issue

• Closes Include Op in message when raising NotImplementedError from grad  #711
• Related to #

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):

---

📚 Documentation preview 📚: https://pytensor--1314.org.readthedocs.build/en/1314/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.99%. Comparing base (b75c18f) to head (0410b3c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1314   +/-   ##
=======================================
  Coverage   81.99%   81.99%           
=======================================
  Files         188      188           
  Lines       48506    48506           
  Branches     8672     8672           
=======================================
  Hits        39771    39771           
  Misses       6583     6583           
  Partials     2152     2152           

Files with missing lines	Coverage Δ
pytensor/graph/op.py	88.08% <100.00%> (ø)

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[ricardoV94]

Thanks @Aarsh-Wankar