Avoid qualified name in x:Type binding for Blazor Hybrid template (#29005)

Use an explicit XML namespace for Component, avoiding use
qualified name syntax in the x:Type binding. Qualified names
(like `local:Components.Routes`) aren't currently supported by
XAML Hot Reload, producing the error
"Nested types are not supported: Components.Routes"
and causing XAML Hot Reload to not work. This support
is coming in a future VS update, but for now it's best to avoid
using of the qualified name syntax in our templates, to keep
things broadly compatible and working for new users. We
don't use qualified names in XAML bindings anywhere else
in MAUI XAML templates; this is the last occurrence.

Fixes #20669

Author: Bret Johnson

src/Templates/src/templates/maui-blazor/MainPage.xaml

@@ -2,11 +2,12 @@
 <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              xmlns:local="clr-namespace:MauiApp._1"
+             xmlns:components="clr-namespace:MauiApp._1.Components"
              x:Class="MauiApp._1.MainPage">
 
     <BlazorWebView x:Name="blazorWebView" HostPage="wwwroot/index.html">
         <BlazorWebView.RootComponents>
-            <RootComponent Selector="#app" ComponentType="{x:Type local:Components.Routes}" />
+            <RootComponent Selector="#app" ComponentType="{x:Type components:Routes}" />
         </BlazorWebView.RootComponents>
     </BlazorWebView>