[AOT compatible] Make HostsUILib become AOT compatible (#36136)

* Remove AOT configuration

* Refer to AOT compatibility props

---------

Co-authored-by: Yu Leng (from Dev Box) <yuleng@microsoft.com>

src/modules/Hosts/HostsUILib/Helpers/DuplicateService.cs

@@ -14,7 +14,7 @@ using Microsoft.UI.Dispatching;
 
 namespace HostsUILib.Helpers
 {
-    public class DuplicateService : IDuplicateService, IDisposable
+    public partial class DuplicateService : IDuplicateService, IDisposable
     {
         private record struct Check(string Address, string[] Hosts);
 

src/modules/Hosts/HostsUILib/Helpers/HostsService.cs

@@ -21,7 +21,7 @@ using Microsoft.Win32;
 
 namespace HostsUILib.Helpers
 {
-    public class HostsService : IHostsService, IDisposable
+    public partial class HostsService : IHostsService, IDisposable
     {
         private const string _backupSuffix = $"_PowerToysBackup_";
         private const int _defaultBufferSize = 4096; // From System.IO.File source code

src/modules/Hosts/HostsUILib/HostsUILib.csproj

@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <!-- Look at Directory.Build.props in root for common stuff as well -->
   <Import Project="..\..\..\Common.Dotnet.CsWinRT.props" />
+  <Import Project="..\..\..\Common.Dotnet.AotCompatibility.props" />
 
   <PropertyGroup>
     <OutputType>Library</OutputType>