Added a UiTest (#20372)

Author: kubaflo

src/Controls/samples/Controls.Sample.UITests/Issues/Issue20372.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.Issue20372"
+             xmlns:ns="clr-namespace:Maui.Controls.Sample.Issues">
+    <ContentPage.Resources>
+        <Style x:Key="PrimaryStyle"
+               TargetType="Label">
+            <Setter Property="FontSize" Value="22" />
+            <Setter Property="TextColor" Value="MediumPurple" />
+        </Style>
+    </ContentPage.Resources>
+
+    <VerticalStackLayout Margin="20">
+
+        <Label TextType="Html"
+               x:Name="label1"
+               Style="{StaticResource PrimaryStyle}">
+            <Label.Text>
+                <![CDATA[
+                    <strong>Bold Text</strong><br>
+                    <em>italics</em><br>
+                    <ul>
+                      <li>Item 1</li>
+                      <li>Item 2</li>
+                    </ul>
+                ]]>
+            </Label.Text>
+        </Label>
+        
+        <Label TextType="Html">
+            <Label.Text>
+                <![CDATA[
+                    <strong>Bold Text</strong><br>
+                    <em>italics</em><br>
+                    <ul>
+                      <li>Item 1</li>
+                      <li>Item 2</li>
+                    </ul>
+                ]]>
+            </Label.Text>
+        </Label>
+
+    </VerticalStackLayout>
+</ContentPage>

src/Controls/samples/Controls.Sample.UITests/Issues/Issue20372.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.Github, 20372, "[iOS] HTML Label not applying Bold or Italics on iOS", PlatformAffected.iOS)]
+	public partial class Issue20372 : ContentPage
+	{
+		public Issue20372()
+		{
+			InitializeComponent();
+		}
+	}
+}

src/Controls/tests/UITests/Tests/Issues/Issue20372.cs

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+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.AppiumTests.Issues
+{
+	public class Issue20372 : _IssuesUITest
+	{
+		public override string Issue => "[iOS] HTML Label not applying Bold or Italics on iOS";
+
+		public Issue20372(TestDevice device) : base(device)
+		{
+		}
+
+		[Test]
+		public void BothHtmlLabelsShouldApplyBoldAndItalicaProperties()
+		{
+			this.IgnoreIfPlatforms(new TestDevice[] { TestDevice.Mac, TestDevice.Windows, TestDevice.Android });
+
+			_ = App.WaitForElement("label1");
+
+			// Both labels should have proper text attributes
+			VerifyScreenshot();
+		}
+	}
+}