title: Equivalent of ValidateEntity in Core3.0
body: <p>It seems 
   protected override DbEntityValidationResult ValidateEntity 
  is removed from IdentityDbContext class in packages ( Microsoft.AspNetCore.Identity.EntityFrameworkCore) in latest versions (2.2.0 and 3.0)</p>
  
  <p>How can I validate database in Core 3.0 or Core 2.2?</p>