Open
Description
Once Jupyter extension is no longer installed by default (#18073), it would be nice if we could improve the discoverability of interactive window/cell execution features for files that have the #%% marker.
One idea is to display a code lens with "Install Jupyter extension to execute cells" above the #%% marker, or just show a notification saying Jupyter extension is recommended (latter would be better if handled by VS Code IMO)
Ideally when people right click on the editor we would also suggest to install the Jupyter extension to run the file in the interactive window