Notebooks: Use new Python installation after configuration change (#14765)

* start new jupyter server

* restart session working (removed extra code)

* only restart server once

* shutdown session first then stop server

* add comments remove extra lines

* add comment

* fix test

* only restart jupyter sessions

* Dispose jupytersessionmanager and create new one

* move restart server logic out of notebookmodel

* move methods to azdata proposed

* pr comment

extensions/notebook/src/jupyter/jupyterServerInstallation.ts

@@ -438,6 +438,7 @@ export class JupyterServerInstallation implements IJupyterServerInstallation {
 
 						this._installCompletion.resolve();
 						this._installInProgress = false;
+						await vscode.commands.executeCommand('notebook.action.restartJupyterNotebookSessions');
 					})
 					.catch(err => {
 						let errorMsg = msgDependenciesInstallationFailed(utils.getErrorMessage(err));