[Security Solution] skips Flaky test (elastic#195435)

## Summary

Skips Flaky test : elastic#189794

x-pack/plugins/security_solution/public/timelines/components/timeline/tabs/query/query_tab_unified_components.test.tsx

@@ -901,7 +901,8 @@ describe('query tab with unified timeline', () => {
         );
       });
 
-      it(
+      // Flaky: https://github.com/elastic/kibana/issues/189794
+      it.skip(
         'should have the notification dot & correct tooltip',
         async () => {
           renderTestComponents();