[Testing] Added UI Test for manual test D4 (#18650)

* Added UI Test

* Updated test

src/Controls/samples/Controls.Sample.UITests/Issues/Issue18647.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.Issue18647">
+    <VerticalStackLayout>
+        <Label 
+            AutomationId="WaitForStubControl"
+            Text="1. Input the string 'aBcDeFg' into the editor below." />
+        <Label 
+            Text="2. The test fails if the editor below does not display the string 'aBcDeFg' exactly (case-sensitive)." />
+        <Editor 
+            AutomationId="NoneTextTransformEditor"
+            Text=""     
+            TextTransform="None" />
+        <Label 
+            Text="3. Input the string 'aBcDeFg' into the editor below." />
+        <Label 
+            Text="4. The test fails if the editor below does not display the string 'abcdefg' exactly (case-sensitive)." />
+        <Editor 
+            AutomationId="LowercaseTextTransformEditor"
+            Text=""
+            TextTransform="Lowercase" />
+        <Label
+            Text="5. Input the string 'aBcDeFg' into the editor below." />
+        <Label 
+            Text="6. The test fails if the editor below does not display the string 'ABCDEFG' exactly (case-sensitive)." />
+        <Editor 
+            AutomationId="UppercaseTextTransformEditor"
+            Text=""            
+            TextTransform="Uppercase" />
+        <Label 
+            Text="7. The test fails if the editor below does not display the string 'abcdefg' exactly (case-sensitive)." />
+        <Editor 
+            AutomationId="FilledLowercaseTextTransformEditor"
+            Text="aBcDeFg"    
+            TextTransform="Lowercase" />
+        <Label 
+            Text="8. The test fails if the editor below does not display the string 'ABCDEFG' exactly (case-sensitive)." />
+        <Editor 
+            AutomationId="FilledUppercaseTextTransformEditor"
+            Text="aBcDeFg"
+            TextTransform="Uppercase" />
+    </VerticalStackLayout>
+</ContentPage>

src/Controls/samples/Controls.Sample.UITests/Issues/Issue18647.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, "D4", "Editor TextTransform property works as expected", PlatformAffected.All)]
+	public partial class Issue18647 : ContentPage
+	{
+		public Issue18647()
+		{
+			InitializeComponent();
+		}
+	}
+}

src/Controls/tests/UITests/Tests/Issues/Issue18647.cs

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+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.AppiumTests.Issues
+{
+	public class Issue18647 : _IssuesUITest
+	{
+
+		public Issue18647(TestDevice device) : base(device)
+		{
+		}
+
+		public override string Issue => "Editor TextTransform property works as expected";
+
+		[Test]
+		public void EditorTextTransformWorks()
+		{
+			App.WaitForElement("WaitForStubControl");
+
+			// 1. Input the string 'aBcDeFg' into the editor below.
+			App.EnterText("NoneTextTransformEditor", "aBcDeFg");
+
+			// 2. The test fails if the editor below does not display the string 'aBcDeFg' exactly (case-sensitive).
+			var result2 = App.FindElement("NoneTextTransformEditor").GetText()?.Trim();
+			Assert.AreEqual("aBcDeFg", result2);
+
+			// 3. Input the string 'aBcDeFg' into the editor below.
+			App.EnterText("LowercaseTextTransformEditor", "aBcDeFg");
+
+			// 4. The test fails if the editor below does not display the string 'abcdefg' exactly (case-sensitive).
+			var result4 = App.FindElement("LowercaseTextTransformEditor").GetText()?.Trim();
+			Assert.AreEqual("abcdefg", result4);
+
+			// 5. Input the string 'aBcDeFg' into the editor below.
+			App.EnterText("UppercaseTextTransformEditor", "aBcDeFg");
+
+			// 6. The test fails if the editor below does not display the string 'ABCDEFG' exactly (case-sensitive).
+			var result6 = App.FindElement("UppercaseTextTransformEditor").GetText()?.Trim();
+			Assert.AreEqual("ABCDEFG", result6);
+
+			// 7. The test fails if the editor below does not display the string 'abcdefg' exactly (case-sensitive).
+			var result7 = App.FindElement("FilledLowercaseTextTransformEditor").GetText()?.Trim();
+			Assert.AreEqual("abcdefg", result7);
+
+			// 8. The test fails if the editor below does not display the string 'ABCDEFG' exactly (case-sensitive).
+			var result8 = App.FindElement("FilledUppercaseTextTransformEditor").GetText()?.Trim();
+
+			Assert.AreEqual("ABCDEFG", result8);
+		}
+	}
+}