Test new notebook renderer API

[connor4312]

Refs: #123540

• anyOS @aeschli
• anyOS @andreamah

Complexity: 4

Authors: @connor4312, @mjbvz

Create Issue

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The issue provides a good description of the problems and features. You can test this with an existing extension, like github-issues-notebooks, or create your own renderer via npm install -g generator-code && yo code --insiders

Verify that the API and described typings work as expected. Note that messaging is separate (#123601)

[mjbvz]

I believe that Joh created a test for this: #124995

Closing as a duplicate

[mjbvz]

Ah the bot snuck in while I was leaving the comment. Instead of running assignments again, please be available to help out on other test items