Add mocked notebook runner

[williambdean]

Add mockable notebook runner

• Notebook follows style guide https://docs.pymc.io/en/latest/contributing/jupyter_style.html
• PR description contains a link to the relevant issue: Broken notebooks #723
  • a tracker one for existing notebooks (tracker issues have the "tracker id" label)
  • or a proposal one for new notebooks
• Check the notebook is not excluded from any pre-commit check: https://github.com/pymc-devs/pymc-examples/blob/main/.pre-commit-config.yaml

Helpful links

• https://github.com/pymc-devs/pymc-examples/blob/main/CONTRIBUTING.md
• Broken notebooks #723

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📚 Documentation preview 📚: https://pymc-examples--740.org.readthedocs.build/en/740/