Report build failure when code execution fails

[brian-rose]

Proposal

Particularly for CI purposes, it would be great to have a version of

myst build --execute

that exits and reports failure if any code cells raise errors / exceptions (except those tagged with raises-exception).

I think this would be equivalent to

sphinx:
  config:
    nb_execution_raise_on_error:

in JupyterBook 1, which we have relied on for quality control in Project Pythia.