Fixed Picker Items are not Displaying on macOS platform (#27535)

* Fixed the picker view items source does not display on mac platform

* Added the test case

* Added the output images.

* Fixed the picker view items source does not display on mac platform

* Added the test case

* Added the output images.

* Create ShouldDisplayPickerItemsWhenOpeningPicker.png

Added the output image on windows platform

* Ignore the test case on catalyst platform

* Added the test case for mac platform

* Added the macOS output image

* Added the comment line for fix.

Author: NanthiniMahalingam

src/Controls/tests/TestCases.Android.Tests/snapshots/android/ShouldDisplayPickerItemsWhenOpeningPicker.png

@@ -0,0 +1,15 @@
+namespace Controls.TestCases.HostApp.Issues;
+
+[Issue(IssueTracker.Github, 27474, "Picker view items are not displayed when setting the title on the picker control", PlatformAffected.macOS)]
+public class Issue27474 : ContentPage
+{
+	public Issue27474()
+	{
+		Content = new Picker
+		{
+			AutomationId = "Picker",
+			ItemsSource = new List<string> { "Badminton", "Football", "Cricket", "Chess", "Swimming" },
+			Title = "Select sports",
+		};
+	}
+}

src/Controls/tests/TestCases.HostApp/Issues/Issue27474.cs

@@ -0,0 +1,24 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+    public class Issue27474 : _IssuesUITest
+    {
+        public Issue27474(TestDevice testDevice) : base(testDevice)
+        {
+        }
+
+        public override string Issue => "Picker view items are not displayed when setting the title on the picker control";
+
+        [Test]
+        [Category(UITestCategories.Picker)]
+        public void ShouldDisplayPickerItemsWhenOpeningPicker()
+        {
+            App.WaitForElement("Picker");
+            App.Click("Picker");
+            VerifyScreenshot();
+        }
+    }
+}

src/Controls/tests/TestCases.Mac.Tests/snapshots/mac/ShouldDisplayPickerItemsWhenOpeningPicker.png

@@ -49,8 +49,9 @@ void DisplayAlert(MauiPicker uITextField)
 			var pickerView = new UIPickerView(frame);
 			pickerView.Model = new PickerSource(this);
 			pickerView?.ReloadAllComponents();
-
-			var pickerController = UIAlertController.Create(VirtualView.Title, "", UIAlertControllerStyle.ActionSheet);
+			// The UIPickerView is displayed as a subview of the UIAlertController when an empty string is provided as the title, instead of using the VirtualView title. 
+			// This behavior deviates from the expected native macOS behavior.
+			var pickerController = UIAlertController.Create("", "", UIAlertControllerStyle.ActionSheet);
 
 			// needs translation
 			pickerController.AddAction(UIAlertAction.Create("Done",