adds test that action vars are rendered for alert action parms

resolves #60083

Author: pmuellr

x-pack/test/functional_with_es_ssl/apps/triggers_actions_ui/alerts.ts

@@ -80,10 +80,9 @@ export default ({ getPageObjects, getService }: FtrProviderContext) => {
       await loggingMessageInput.click();
       await loggingMessageInput.clearValue();
       await loggingMessageInput.type('test message');
-      // TODO: uncomment variables test when server API will be ready
-      // await testSubjects.click('slackAddVariableButton');
-      // const variableMenuButton = await testSubjects.find('variableMenuButton-0');
-      // await variableMenuButton.click();
+      await testSubjects.click('slackAddVariableButton');
+      const variableMenuButton = await testSubjects.find('variableMenuButton-0');
+      await variableMenuButton.click();
       await find.clickByCssSelector('[data-test-subj="saveAlertButton"]');
       const toastTitle = await pageObjects.common.closeToast();
       expect(toastTitle).to.eql(`Saved '${alertName}'`);