[Security Solution][Detections] Fixes broken cypress test (#109533) (#…

…109552)

## Summary

Fixes `acknowledged.spec.ts` test that is currently failing on some ci builds

### Checklist

Delete any items that are not applicable to this PR.

- [x] [Unit or functional tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html) were updated or added to match the most common scenarios

Co-authored-by: Davis Plumlee <[email protected]>

x-pack/plugins/security_solution/cypress/integration/detection_alerts/acknowledged.spec.ts

@@ -53,7 +53,7 @@ describe.skip('Marking alerts as acknowledged', () => {
         refreshPage();
         waitForAlertsToBeLoaded();
         goToOpenedAlerts();
-
+        waitForAlertsToBeLoaded();
         const expectedNumberOfAlerts = +numberOfAlerts - numberOfAlertsToBeMarkedAcknowledged;
         cy.get(ALERTS_COUNT).should('have.text', `${expectedNumberOfAlerts} alerts`);