Datasource cannot be obtained via destructuring due to the KO integrration (#30872)

Author: EugeniyKiyashko

packages/devextreme/js/__internal/ui/drop_down_editor/m_drop_down_list.ts

@@ -658,7 +658,8 @@ class DropDownList<
     | DataSourceOptions<GroupItem<Item>>
     | null
     | undefined {
-    const { dataSource, grouped } = this.option();
+    const { grouped } = this.option();
+    const dataSource = this.option('dataSource');
 
     if (dataSource && grouped) {
       return getDataSourceOptions(dataSource);

packages/devextreme/js/__internal/ui/list/list.base.ts

@@ -550,7 +550,8 @@ export class ListBase extends CollectionWidget<ListBaseProperties, Item> {
     | DataSourceOptions<GroupItem<Item>>
     | null
     | undefined {
-    const { dataSource, grouped } = this.option();
+    const { grouped } = this.option();
+    const dataSource = this.option('dataSource');
 
     if (dataSource && grouped) {
       return getDataSourceOptions<Item>(dataSource);