Run All Cells Notebook Implementation (#4713)

* runAllCells API

* add comment

* more run cells fixes

* Add integration test

* Add multiple cell SQL notebook test

* Comment out python tests as they fail in the lab

* remove unused imports

* PR comments

* Remove localize

* Return true instead of promise.resolve(true)

src/sql/workbench/services/notebook/common/notebookService.ts

@@ -109,5 +109,6 @@ export interface INotebookEditor {
 	isVisible(): boolean;
 	executeEdits(edits: ISingleNotebookEditOperation[]): boolean;
 	runCell(cell: ICellModel): Promise<boolean>;
+	runAllCells(): Promise<boolean>;
 	clearAllOutputs(): Promise<boolean>;
 }