Fix the Collection view empty view not fill the vertical space

src/Controls/src/Core/Platform/Windows/CollectionView/ItemsViewStyles.xaml

@@ -67,7 +67,7 @@
         <Border BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}">
             <Grid>
                 <ContentControl x:Name="EmptyViewContentControl" 
-                                HorizontalContentAlignment="Stretch" VerticalAlignment="Stretch"/>
+                                HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"/>
                 <ScrollViewer x:Name="ScrollViewer" 
                                 TabNavigation="{TemplateBinding TabNavigation}"
                                 HorizontalScrollMode="{TemplateBinding ScrollViewer.HorizontalScrollMode}"

src/Controls/tests/TestCases.HostApp/Issues/Issue27229.xaml

@@ -6,24 +6,24 @@
              xmlns:local="clr-namespace:Maui.Controls.Sample.Issues"
              x:Name="ThisMainPage"
              Title="Main Page">
-      <CollectionView>
+    <CollectionView AutomationId="ReadyToTest">
         <CollectionView.EmptyView>
             <ContentView>
-                <StackLayout HorizontalOptions="Center" VerticalOptions="Center">
+                <StackLayout HorizontalOptions="Center"
+                        VerticalOptions="Center">
                     <Label
                         Margin="10,25,10,10"
                         FontAttributes="Bold"
                         FontSize="18"
                         HorizontalOptions="Fill"
                         HorizontalTextAlignment="Center"
-                        AutomationId="ReadyToTest"
-                        Text="No results matched your filter." />
+                        Text="No results matched your filter."/>
                     <Label
                         FontAttributes="Italic"
                         FontSize="12"
                         HorizontalOptions="Fill"
                         HorizontalTextAlignment="Center"
-                        Text="Try a broader filter?" />
+                        Text="Try a broader filter?"/>
                 </StackLayout>
             </ContentView>
         </CollectionView.EmptyView>

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue27229.cs

@@ -1,4 +1,3 @@
-#if TEST_FAILS_ON_WINDOWS
 using NUnit.Framework;
 using UITest.Appium;
 using UITest.Core;
@@ -19,5 +18,4 @@ public void CollectionViewEmptyViewFillsAvailableSpaceByDefault()
 			VerifyScreenshot();
 		}
 	}
-}
-#endif
+}