[net10.0] [iOS, Windows] Fix: Switch does not use the native default on color when OnColor is unset (#29694)

* Fixed Switch default color issue on iOS

* Fixed Switch default color issue on Windows

* UISwitch ff color changes

* Reverted off-color changes

* Added test sample

* Test sample changes

* Added snapshots

Author: Tamilarasan-Paranthaman

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

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+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 29693, "The default native on color is not displayed when the Switch on color is not explicitly set", PlatformAffected.UWP)]
+public class Issue29693 : ContentPage
+{
+	public Issue29693()
+	{
+		var defaultOnSwitch = new Switch
+		{
+			IsToggled = true,
+			VerticalOptions = LayoutOptions.Center,
+			HorizontalOptions = LayoutOptions.Center,
+		};
+
+		var defaultOffSwitch = new Switch
+		{
+			VerticalOptions = LayoutOptions.Center,
+			HorizontalOptions = LayoutOptions.Center
+		};
+
+		var switchControl1 = new Switch
+		{
+			IsToggled = true,
+			VerticalOptions = LayoutOptions.Center,
+			HorizontalOptions = LayoutOptions.Center
+		};
+
+		var switchControl2 = new Switch
+		{
+			VerticalOptions = LayoutOptions.Center,
+			HorizontalOptions = LayoutOptions.Center
+		};
+
+		var button1 = new Button
+		{
+			Text = "Toggle Switch 3",
+			AutomationId = "button1",
+			VerticalOptions = LayoutOptions.Center,
+			HorizontalOptions = LayoutOptions.Center
+		};
+
+		var button2 = new Button
+		{
+			Text = "Toggle Switch 4",
+			AutomationId = "button2",
+			VerticalOptions = LayoutOptions.Center,
+			HorizontalOptions = LayoutOptions.Center,
+		};
+
+		button1.Clicked += (sender, e) =>
+		{
+			switchControl1.IsToggled = !switchControl1.IsToggled;
+		};
+
+		button2.Clicked += (sender, e) =>
+		{
+			switchControl2.IsToggled = !switchControl2.IsToggled;
+		};
+
+		var verticalStackLayout = new VerticalStackLayout()
+		{
+			Spacing = 20,
+			Padding = new Thickness(20),
+		};
+		verticalStackLayout.Add(defaultOnSwitch);
+		verticalStackLayout.Add(defaultOffSwitch);
+		verticalStackLayout.Add(switchControl1);
+		verticalStackLayout.Add(switchControl2);
+		verticalStackLayout.Add(button1);
+		verticalStackLayout.Add(button2);
+
+		Content = verticalStackLayout;
+	}
+}

src/Controls/tests/TestCases.HostApp/Issues/Issue29693.cs

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+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue29693 : _IssuesUITest
+{
+	public override string Issue => "The default native on color is not displayed when the Switch on color is not explicitly set";
+
+	public Issue29693(TestDevice device)
+	: base(device)
+	{ }
+
+	[Test]
+	[Category(UITestCategories.Switch)]
+	public void VerifySwitchDefaultColors()
+	{
+		App.WaitForElement("button1");
+		App.Tap("button1");
+		App.Tap("button2");
+		VerifyScreenshot();
+	}
+}