[Testing] Added UI Test for manual test E1

src/Controls/samples/Controls.Sample.UITests/Issues/Issue18623.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.Issue18623">
+    <VerticalStackLayout>
+        <Label
+            AutomationId="WaitForStubControl"
+            Text="1. In the Entry control below, input some text. The test passes if the text is not obscured." />
+        <Entry 
+            AutomationId="NoPasswordEntry"
+            IsPassword="False"
+            Placeholder="IsPassword=False" />
+        <Label 
+            Text="2. In the Entry control below, input some text. The test passes if the text is obscured." />
+        <Entry 
+            AutomationId="PasswordEntry"
+            IsPassword="True"
+            Placeholder="IsPassword=True" />
+    </VerticalStackLayout>
+</ContentPage>

src/Controls/samples/Controls.Sample.UITests/Issues/Issue18623.xaml.cs

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+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Xaml;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[XamlCompilation(XamlCompilationOptions.Compile)]
+	[Issue(IssueTracker.ManualTest, "E1", "Entry IsPassword obscure the text", PlatformAffected.All)]
+	public partial class Issue18623 : ContentPage
+	{
+		public Issue18623()
+		{
+			InitializeComponent();
+		}
+	}
+}

src/Controls/tests/UITests/Tests/Issues/Issue18623.cs

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+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.AppiumTests.Issues
+{
+	public class Issue18623 : _IssuesUITest
+	{
+		public Issue18623(TestDevice device) : base(device)
+		{
+		}
+
+		public override string Issue => "Entry IsPassword obscure the text";
+
+		[Test]
+		public async Task EntryIsPasswordObscureText()
+		{
+			this.IgnoreIfPlatforms(new TestDevice[] { TestDevice.iOS },
+				"Currently fails on iOS; see https://github.com/dotnet/maui/issues/18981");
+
+			App.WaitForElement("WaitForStubControl");
+
+			// 1. In the Entry control below, input some text. The test passes if the text is not obscured.
+			App.EnterText("NoPasswordEntry", "Test");
+
+			// 2. In the Entry control below, input some text. The test passes if the text is obscured.
+			App.EnterText("PasswordEntry", "Test");
+
+			// Wait to capture the snapshot after enter the text and
+			// closed the keyboard.
+			await Task.Delay(1000);
+
+			// 3. Verify the result  comparing snapshots.
+			VerifyScreenshot();
+		}
+	}
+}