test: change navigateToLandingPage wait element

Updated navigateToLandingPage to wait on the side nav instead of a page
element since the new landing page can conditionally redirect you to
index management.

x-pack/test_serverless/functional/services/svl_search_navigation.ts

@@ -19,7 +19,8 @@ export function SvlSearchNavigationServiceProvider({
     async navigateToLandingPage() {
       await retry.tryForTime(60 * 1000, async () => {
         await PageObjects.common.navigateToApp('landingPage');
-        await testSubjects.existOrFail('elasticsearchStartPage', { timeout: 2000 });
+        // Wait for the side nav, since the landing page will sometimes redirect to index management now
+        await testSubjects.existOrFail('svlSearchSideNav', { timeout: 2000 });
       });
     },
     async navigateToGettingStartedPage() {