Revert "Add UserPasswordHistories DbSet to IIdentityDbContext"

This reverts commit b1a9ddbee2.

modules/identity/src/Volo.Abp.Identity.EntityFrameworkCore/Volo/Abp/Identity/EntityFrameworkCore/IIdentityDbContext.cs

@@ -22,6 +22,4 @@ public interface IIdentityDbContext : IEfCoreDbContext
     DbSet<IdentityUserDelegation> UserDelegations { get; }
 
     DbSet<IdentitySession> Sessions { get; }
-
-    DbSet<IdentityUserPasswordHistory> UserPasswordHistories { get; }
 }