Show error animation in code cell when error is triggered

[andrewfulton9]

With JupyterLab #15344 the ability to add an error animation to a code call was added.

It should be relatively straight forward to allow the jupyter-ai completers to enable this functionality.

Problem

The jupyter-ai error reporting on inline completion differs from jupyterlab completer. Currently jupyterlab shows a flashing icon in the cell, while jupyter-ai has a notification warning

Proposed Solution

I propose allowing jupyter-ai to emit the error field when there is an error in the generation process. I am not sure if this should be in place of the error notification, or alongside of it. The benefit of keeping it alongside the current notification would be that the current notification gives more context.

Additional context