Chat: Omit onSelectionChanged from suggestions option type (#33339)

Co-authored-by: Ruslan Farkhutdinov <ruslan.farkhutdinov@devexpress.com>

Author: r-farkhutdinov

packages/devextreme/js/ui/chat.d.ts

@@ -538,7 +538,7 @@ export interface dxChatOptions extends WidgetOptions<dxChat> {
      * @type dxButtonGroupOptions
      * @public
      */
-    suggestions?: Omit<ButtonGroupProperties, 'selectionMode' | 'selectedItemKeys' | 'selectedItems'>;
+    suggestions?: Omit<ButtonGroupProperties, 'selectionMode' | 'selectedItemKeys' | 'selectedItems' | 'onSelectionChanged'>;
     /**
      * @docid
      * @default []

packages/devextreme/ts/dx.all.d.ts

@@ -11489,7 +11489,10 @@ declare module DevExpress.ui {
      */
     suggestions?: Omit<
       DevExpress.ui.dxButtonGroup.Properties,
-      'selectionMode' | 'selectedItemKeys' | 'selectedItems'
+      | 'selectionMode'
+      | 'selectedItemKeys'
+      | 'selectedItems'
+      | 'onSelectionChanged'
     >;
     /**
      * [descr:dxChatOptions.typingUsers]