Migrate off of the vscode.proposed.notebookDeprecated API

From https://github.com/microsoft/vscode/issues/146831

Opening to track migrating off of VS Code’s notebook.deprecate api proposal. This proposal is currently not on track for finalization

The suggested fix in this case is to move the output id into the custom metadata: https://github.com/microsoft/vscode/issues/146831#issuecomment-1090265265

[rebornix]

When I was building my Better Error Output renderer, a feature I tried to implement is when the output says missing module xyz, and show a link, which when clicked will insert a cell above the target cell with content %pip install xyz. There isn’t a way for us to locate the output and its containing cell in the extension side, if there isn’t an output id.

[rebornix]

@rchiodo the outputs are generated by Jupyter and as a third party extension, without requesting more information from Jupyter ext, I couldn’t really build the link with necessary info. I would either fetch the info during rendering, or delegate through webview communications. Either way we would need some sort of API in order to know which cell the output is from.