Fix discover preserve url (elastic#63580)

Author: flash1293

x-pack/test/functional/apps/discover/preserve_url.ts

@@ -10,7 +10,6 @@ import { FtrProviderContext } from '../../ftr_provider_context';
 export default function({ getService, getPageObjects }: FtrProviderContext) {
   const esArchiver = getService('esArchiver');
   const PageObjects = getPageObjects(['common', 'discover', 'spaceSelector', 'header']);
-  const appsMenu = getService('appsMenu');
   const globalNav = getService('globalNav');
 
   describe('preserve url', function() {
@@ -26,8 +25,7 @@ export default function({ getService, getPageObjects }: FtrProviderContext) {
       await PageObjects.common.navigateToApp('discover');
       await PageObjects.discover.saveSearch('A Search');
       await PageObjects.common.navigateToApp('home');
-      await appsMenu.clickLink('Discover');
-      await PageObjects.discover.waitUntilSearchingHasFinished();
+      await PageObjects.header.clickDiscover();
       const activeTitle = await globalNav.getLastBreadcrumb();
       expect(activeTitle).to.be('A Search');
     });
@@ -42,15 +40,15 @@ export default function({ getService, getPageObjects }: FtrProviderContext) {
       await PageObjects.spaceSelector.expectHomePage('another-space');
 
       // other space
-      await appsMenu.clickLink('Discover');
+      await PageObjects.header.clickDiscover();
       await PageObjects.discover.saveSearch('A Search in another space');
 
       await PageObjects.spaceSelector.openSpacesNav();
       await PageObjects.spaceSelector.clickSpaceAvatar('default');
       await PageObjects.spaceSelector.expectHomePage('default');
 
       // default space
-      await appsMenu.clickLink('Discover');
+      await PageObjects.header.clickDiscover();
       await PageObjects.discover.waitUntilSearchingHasFinished();
       const activeTitleDefaultSpace = await globalNav.getLastBreadcrumb();
       expect(activeTitleDefaultSpace).to.be('A Search');
@@ -60,7 +58,7 @@ export default function({ getService, getPageObjects }: FtrProviderContext) {
       await PageObjects.spaceSelector.expectHomePage('another-space');
 
       // other space
-      await appsMenu.clickLink('Discover');
+      await PageObjects.header.clickDiscover();
       await PageObjects.discover.waitUntilSearchingHasFinished();
       const activeTitleOtherSpace = await globalNav.getLastBreadcrumb();
       expect(activeTitleOtherSpace).to.be('A Search in another space');