Notebook CodeActionKind Support

[Yoyokrazy]

Fixes: #184028
Re: #179213

** This PR is continuing and adding onto the conversation from #187303. This was tested with the GHINB branch joh/civic-tahr

This PR:

• adds the revised version of the Notebook CodeActionKind type to core
• filters notebook kinds out of providers when triggered by an autosave (work for future, alongside a UI way to surface these to a nb user)
• cleans up the notebook saveParticipant for CodeActions
• revises the setting to align with editor CodeAction style and enum

---

The current logs from this branch with the change above are as follows when explicitly saving a GHINB

• build GHINB ext with joh/civic-tahr branch
• add the following to your settings.json: "notebook.codeActionsOnSave": { "notebook.source.normalizeVariableNames": "explicit" }
• open sample github issue notebook with a few variables + queries
• ctrl + s to explicitly save

The provider is created, and now only called against the first cell of the notebook upon an explicit save.

[rebornix]

👍