Revert IntegrationTests

Author: stephenquan

src/CommunityToolkit.Maui.SourceGenerators.Internal.UnitTests/BindablePropertyAttributeSourceGeneratorTests/IntegrationTests.cs

@@ -1,3 +1,8 @@
+using CommunityToolkit.Maui.SourceGenerators.Internal.UnitTests;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Testing;
+using Microsoft.CodeAnalysis.Testing;
 using Xunit;
 
 namespace CommunityToolkit.Maui.SourceGenerators.Internal.UnitTests.BindablePropertyAttributeSourceGeneratorTests;