Configure EnvelopeReport as a keyless entity

Added Entity Framework model configuration for EnvelopeReport in EGDbContextBase, specifying it as a keyless entity using HasNoKey(). This allows EnvelopeReport to be used without a primary key in the database context.

EnvelopeGenerator.Infrastructure/EGDbContext.cs

@@ -202,6 +202,10 @@ public abstract class EGDbContextBase : DbContext
             .HasForeignKey(annot => annot.ElementId);
         #endregion
 
+        #region EnvelopeReport
+        modelBuilder.Entity<EnvelopeReport>().HasNoKey();
+        #endregion
+
         #region Trigger
         // Configure entities to handle database triggers
         void AddTrigger<T>() where T : class => _triggers