[Testing] Written UI test for the issue resolved in PR 25453 (#25573)

* Automation sample for 25453.

* Simplified the sample.

* Removed platform conditions.

Author: Tamilarasan-Paranthaman

src/Controls/tests/TestCases.HostApp/Issues/Issue25504.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Maui.Controls.Sample.Issues.Issue25504"
+             xmlns:ns="clr-namespace:Maui.Controls.Sample.Issues">
+
+  <ListView x:Name="listView"
+            AutomationId="listView"
+            HeightRequest="50"
+            ItemSelected="OnItemSelected">
+    <ListView.ItemsSource>
+      <x:Array Type="{x:Type x:String}">
+        <x:String>Introduction to .NET MAUI</x:String>
+      </x:Array>
+    </ListView.ItemsSource>
+    <ListView.ItemTemplate>
+      <DataTemplate>
+        <ViewCell>
+          <Label Text="{Binding .}"
+                 AutomationId="Label"/>
+        </ViewCell>
+      </DataTemplate>
+    </ListView.ItemTemplate>
+  </ListView>
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue25504.xaml.cs

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+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 25504, "ListView crashes when changing the root page inside the ItemSelected event", PlatformAffected.UWP)]
+	public partial class Issue25504 : ContentPage
+	{
+		public Issue25504()
+		{
+			InitializeComponent();
+			this.BindingContext = this;
+		}
+
+		private void OnItemSelected(object sender, SelectedItemChangedEventArgs args)
+		{
+			if (Application.Current?.Windows.Count > 0)
+			{
+				Application.Current.Windows[0].Page = new DetailsPage();
+			}
+		}
+
+		public class DetailsPage : ContentPage
+		{
+			public DetailsPage()
+			{
+				Content = new Label { Text = "Details Page", AutomationId = "DetailsPage" };
+			}
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/XFIssue/Issue25504.cs

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+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue25504 : _IssuesUITest
+	{
+		public override string Issue => "ListView crashes when changing the root page inside the ItemSelected event";
+
+		public Issue25504(TestDevice device)
+		: base(device)
+		{ }
+
+		[Test]
+		[Category(UITestCategories.ListView)]
+		public void ListViewShouldNotCrashWhenChangingRootPage()
+		{
+			App.WaitForElement("listView");
+			App.Tap("Label");
+			var testLabel = App.WaitForElement("DetailsPage");
+			Assert.That(testLabel.GetText(), Is.EqualTo("Details Page"));
+		}
+	}
+}