Fix #103881. Skip metadata when copying cells.

src/vs/workbench/contrib/notebook/common/model/notebookCellTextModel.ts

@@ -431,8 +431,7 @@ export function cloneNotebookCellTextModel(cell: NotebookCellTextModel) {
 			outputs: output.outputs,
 			/* paste should generate new outputId */ outputId: UUID.generateUuid()
 		})),
-		metadata: { ...cell.metadata },
-		// Don't include internalMetadata, ie execution state, this is not to be shared
+		metadata: {}
 	};
 }