Save charting state in SQL notebooks. (#9789)

src/sql/workbench/api/browser/mainThreadNotebookDocumentsAndEditors.ts

@@ -663,6 +663,7 @@ export class MainThreadNotebookDocumentsAndEditors extends Disposable implements
 				return NotebookChangeKind.ContentUpdated;
 			case NotebookChangeType.KernelChanged:
 			case NotebookChangeType.TrustChanged:
+			case NotebookChangeType.CellMetadataUpdated:
 				return NotebookChangeKind.MetadataUpdated;
 			case NotebookChangeType.Saved:
 				return NotebookChangeKind.Save;