[Misc] Try reducing flickering in UserDirectoryIT

(cherry picked from commit 0b145548)

xwiki-platform-core/xwiki-platform-user/xwiki-platform-user-directory/xwiki-platform-user-directory-test/xwiki-platform-user-directory-test-docker/src/test/it/org/xwiki/user/directory/test/ui/UserDirectoryIT.java

@@ -76,6 +76,7 @@ void verifyUserIsListed(TestUtils setup, LogCaptureConfiguration logCaptureConfi
 
         // Go back to the user directory page since the user creation navigated to another page
         page = UserDirectoryPage.gotoPage();
+        liveTableElement = page.getUserDirectoryLiveTable();
         assertEquals(1, liveTableElement.getRowCount());
         assertTrue(liveTableElement.hasRow("User ID", "test"));
         assertTrue(liveTableElement.hasRow("First Name", "John"));
@@ -83,6 +84,9 @@ void verifyUserIsListed(TestUtils setup, LogCaptureConfiguration logCaptureConfi
 
         // Log out to verify the livetable works in guest view too
         setup.forceGuestUser();
+        // Create a new instance of the page to ensure that we wait for it to be fully loaded.
+        page = new UserDirectoryPage();
+        liveTableElement = page.getUserDirectoryLiveTable();
         assertEquals(1, liveTableElement.getRowCount());
         assertTrue(liveTableElement.hasRow("User ID", "test"));
         assertTrue(liveTableElement.hasRow("First Name", "John"));