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

src/sql/workbench/contrib/notebook/test/emptySessionClasses.ts

@@ -42,6 +42,13 @@ export class SessionManager implements nb.SessionManager {
 	shutdown(id: string): Thenable<void> {
 		return Promise.resolve();
 	}
+
+	shutdownAll(): Thenable<void> {
+		return Promise.resolve();
+	}
+
+	dispose(): void {
+	}
 }
 
 export class EmptySession implements nb.ISession {