Support Jupyter Notebooks in Rapid Diffs

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We should support Jupyter notebook (.ipynb) diffs in Rapid Diffs.

Issue containing some diff examples:

• gitlab-org/incubation-engineering/mlops/ipynb-mr-sample!7 (diffs)
• gitlab-org/incubation-engineering/mlops/ipynb-mr-sample!4 (diffs)

Context for existing issues with these diffs: https://gitlab.com/gitlab-org/modelops/mlops/mlops/-/issues/38