Fail docs build on errors in notebooks

[michaelosthege]

The goals here are:

1. to fix an error in the a notebook (Update Prior and Posterior Predictive Checks tutorial #6322) and
2. make sure that this doesn't happen again (Errors in core notebooks should fail doc build #6323).

The first commit should achieve & confirm goal 2., and subsequent commits will be added to fix notebooks.

Checklist

• Explain important implementation details 👆
• Make sure that the pre-commit linting/style checks pass.
• Link relevant issues (preferably in nice commit messages)
• Are the changes covered by tests and docstrings?
• Fill out the short summary sections 👇

Major / Breaking Changes

• None

Bugfixes / New features

• None

Docs / Maintenance

• Make sure that notebook errors fail the docs build
• Fix notebook errors

[OriolAbril]

Thanks, seems to be working. I would also add nb_execution_allow_errors=False to shield ourselves from potential default changes

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

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[OriolAbril]

Let's try nb_execution_timeout = 60 and see if it is enough time, otherwise reduce chains and/or draws in the longest running cells.