Fix flakiness in load and save agg-based visualizations (#109066) (#1…

…09200)

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

Co-authored-by: Stratoula Kalafateli <efstratia.kalafateli@elastic.co>

test/functional/page_objects/visualize_page.ts

@@ -326,6 +326,7 @@ export class VisualizePageObject extends FtrService {
     if (navigateToVisualize) {
       await this.clickLoadSavedVisButton();
     }
+    await this.listingTable.searchForItemWithName(vizName);
     await this.openSavedVisualization(vizName);
   }