chore(*): Attempt to fix sporadic test.

Author: MKirova

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.integration.spec.ts

@@ -618,7 +618,7 @@ describe('IgxHierarchicalGrid Integration #hGrid', () => {
             await wait(30);
             fixture.detectChanges();
             hierarchicalGrid.verticalScrollContainer.scrollTo(hierarchicalGrid.dataView.length - 1);
-            await wait(30);
+            await wait(100);
             fixture.detectChanges();
 
             // check last row is loaded and is in view