feat(custom-widgets): complete Custom JSX v2 (#6390)

packages/widgets/src/custom-api/index.ts

@@ -9,6 +9,8 @@ export const { definition, componentLoader } = createWidgetDefinition("customApi
   createOptions() {
     return optionsBuilder.from((factory) => ({
       definitionId: factory.customWidgetSelect({ defaultValue: "" }),
+      configuration: factory.customWidgetConfiguration(),
+      configurationVersion: factory.internal({ defaultValue: 1 }),
       refreshInterval: factory.slider({
         defaultValue: 30,
         validate: z.number().min(1).max(3600),