fix tests with security enabled (#1469)

Fix Notification tests when Security enabled to fix CI failure -> https://ci.opensearch.org/ci/dbc/integ-test-opensearch-dashboards/2.16.0/7852/linux/x64/rpm/test-results/6147/integ-test/notificationsDashboards/with-security/cypress-videos/plugins/notifications-dashboards/1_email_senders_and_groups.spec.js.mp4

Signed-off-by: Riya Saxena <riysaxen@amazon.com>
(cherry picked from commit ad69043)

cypress/integration/plugins/notifications-dashboards/1_email_senders_and_groups.spec.js

@@ -259,6 +259,10 @@ describe('Test create, edit and delete recipient group', () => {
   });
 
   it('deletes recipient groups', () => {
+    cy.wait(NOTIFICATIONS_DELAY);
+    cy.get('tbody > tr').should(($tr) => {
+      expect($tr, '1 row').to.have.length(1);
+    });
     cy.get('[data-test-subj="checkboxSelectAll"]').click({ force: true });
     cy.wait(NOTIFICATIONS_DELAY);
     cy.get('[data-test-subj="recipient-groups-table-delete-button"]').click({