FIX: Show traceback before raising ExecutionError

[paugier]

When

nb_execution_raise_on_error = True
nb_execution_show_tb = True

the traceback is not showed, which is very inconvenient when it happens during a CI job!

I guess it is only an issue of incompatibility between these two options, which should be fixed by this swap.

Does it make sense?

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[agoose77]

This PR looks reasonable. For context, I don't think this option is that useful.

• If you're only using myst-nb, one can pass the -T or -v arguments to sphinx-build, which show tracebacks in stderr, if nb_execution_raise_on_error is set to True.
• If you're using jupyter-book, the same applies (enable verbose output -v), but it's more tricky to set this option as it's not passed through from _config.yml. You can patch the Sphinx config with

  sphinx:
    recursive_update: true
    config:
      nb_execution_raise_on_error: true

Despite this, I don't see any harm in this PR, and it might prove useful.

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