Added error msg to output notebook in case of exception

[mehtamohit013]

Describe your changes

Added error messages to the top and above the code where the exception occurs in markdown

Issue ticket number and link

Closes #63

Checklist before requesting a review

• [X] I have performed a self-review of my code
• [X] I have added thorough tests (when necessary).
• [X] I have added the right documentation in the docstring and changelog (when needed)

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:books: Documentation preview :books:: https://ploomber-engine--67.org.readthedocs.build/en/67/

[edublancas]

is this ready for review? don't forget to request the review:

[mehtamohit013]

GitHub still not showing the Reviewer Panel for me :(

Also, @idomic , below is the papermill and ploomber engine output respectively:

I don't understand what you earlier commented on issue #63 : "The Cell that failed is also marked with a red and the output is red as well"

[idomic]

@mehtamohit013 this red bolded text is exactly what I meant (so not only top notebook but the actual cell as well). Nice job!