chore: provide more waiting time in test (#7999)

Author: ZheSun88

vaadin-platform-react-hybrid-test/pom.xml

@@ -189,6 +189,7 @@
                     <plugin>
                         <groupId>org.springframework.boot</groupId>
                         <artifactId>spring-boot-maven-plugin</artifactId>
+                        <version>${spring.boot.version}</version>
                         <executions>
                             <execution>
                                 <id>repackage</id>

vaadin-platform-react-hybrid-test/src/test/java/com/vaadin/platform/react/test/HillaMainLayoutIT.java

@@ -65,8 +65,8 @@ public void backNavigationTest() {
     public void forwardNavigationTest() {
         findElement(By.id("toHello")).click();
 
-        Assert.assertTrue("Navigation with NavLink failed.",
-                $(VerticalLayoutElement.class).id("HelloReact").isDisplayed());
+        waitForElement("Navigation with NavLink failed.",
+                By.id("HelloReact"));
 
         // Navigate to Flow view
         getMenuElement("Flow in hilla").get().click();
@@ -76,13 +76,13 @@ public void forwardNavigationTest() {
         getDriver().navigate().back();
         getDriver().navigate().back();
 
-        Assert.assertTrue("Should have returned to initial page",
-                findElement(By.id("toHello")).isDisplayed());
+        waitForElement("Should have returned to initial page",
+                By.id("toHello"));
 
         getDriver().navigate().forward();
 
-        Assert.assertTrue("Expected hilla view after forward",
-                $(VerticalLayoutElement.class).id("HelloReact").isDisplayed());
+        waitForElement("Expected hilla view after forward",
+                By.id("HelloReact"));
 
         getDriver().navigate().forward();