Fixed detection of implicit many-to-many join entity in EF Core 6

Author: Bart Koelman

src/JsonApiDotNetCore/Configuration/ResourceGraphBuilder.cs

@@ -8,7 +8,6 @@
 using JsonApiDotNetCore.Resources.Annotations;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Metadata;
-using Microsoft.EntityFrameworkCore.Metadata.Internal;
 using Microsoft.Extensions.Logging;
 
 namespace JsonApiDotNetCore.Configuration
@@ -81,9 +80,7 @@ public ResourceGraphBuilder Add(DbContext dbContext)
 
         private static bool IsImplicitManyToManyJoinEntity(IEntityType entityType)
         {
-#pragma warning disable EF1001 // Internal Entity Framework Core API usage.
-            return entityType is EntityType { IsImplicitlyCreatedJoinEntityType: true };
-#pragma warning restore EF1001 // Internal Entity Framework Core API usage.
+            return entityType.IsPropertyBag && entityType.HasSharedClrType;
         }
 
         /// <summary>