Raw Cells not being rendered when opening a Jupyter Notebook

Cells of type raw are not being rendered when displaying the file

Example:

https://gitlab.com/gitlab-org/incubation-engineering/mlops/glyter/-/blob/poc/notebooks/sample.ipynb

Actual	Expected

on NBViewer: https://nbviewer.org/urls/gitlab.com/gitlab-org/incubation-engineering/mlops/glyter/-/raw/poc/notebooks/sample.ipynb

Implementation guide:

A minimal example:

• Add a new format type in https://gitlab.com/gitlab-org/gitlab/-/blob/master/gems/ipynbdiff/lib/ipynb_diff/output_transformer.rb#L22-22 for parsing raw output_type

• Add a new testcase in https://gitlab.com/gitlab-org/gitlab/-/blob/2d84e7021eeb07e5da23a6e05017ee75da1777d0/gems/ipynbdiff/spec/ipynb_diff/transformer_spec.rb#L17 (testdata for the other tests is under https://gitlab.com/gitlab-org/gitlab/-/tree/2d84e7021eeb07e5da23a6e05017ee75da1777d0/gems/ipynbdiff/spec/testdata for reference):

input.ipynb should be:

{
"cells": [
{
"cell_type": "raw",
"source": [
"---\n",
"image: python:3.9-buster\n",
"execution: 0 -> 1 -> 2"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"language": "python",
"name": "python3"
},
}

expected.md should be:

%% Cell type:raw 

    ---
    image: python:3.9-buster
    execution: 0 -> 1 -> 2