Don't export SelectKernelReturnArgs (microsoft#164944)

Author: joyceerhl

src/vs/workbench/api/common/extHostNotebookKernels.ts

@@ -35,7 +35,7 @@ interface IKernelData {
 }
 
 type ExtHostSelectKernelArgs = ControllerInfo | { notebookEditor: vscode.NotebookEditor } | ControllerInfo & { notebookEditor: vscode.NotebookEditor } | undefined;
-export type SelectKernelReturnArgs = ControllerInfo | { notebookEditorId: string } | ControllerInfo & { notebookEditorId: string } | undefined;
+type SelectKernelReturnArgs = ControllerInfo | { notebookEditorId: string } | ControllerInfo & { notebookEditorId: string } | undefined;
 type ControllerInfo = { id: string; extension: string };