• Unwrap baseJupyterSession wrapper layers (INotebook and friends`)
• Transition use of executeObservable in nativeInteractiveWindow to new kernelExecution.ts codepath
• Remove dependence on ICell interface. We should directly deal with nbformat cells and notebooks
• Add findMatchingWindow(uri: Uri) to IInteractiveWindowProvider and cleanup nativeInteractiveWindowCommandListener
• One unified command handler for kernel restart and interrupt, shared across native notebooks and interactive window

Here's a set of issues from early 2020 that may or may not related to this work item. Feel free to just close if no longer applicable.

• Remove our old webPanelServer code #1595
• Split the INotebook into smaller types #1603
• NativeEditor.ts and InteractiveWindow.ts could have their 'execution' logic split off #1606