Make BatchId in ResultView a required string

Changed the BatchId property in the ResultView class from a nullable string to a required non-nullable string. This ensures that BatchId must always be provided when creating a ResultView instance, improving data integrity.

src/ReC.Domain/Views/ResultView.cs

@@ -55,7 +55,7 @@ public class ResultView
     public string? Error { get; set; }
 
     [Column("BATCH_ID")]
-    public string? BatchId { get; set; }
+    public required string BatchId { get; set; }
 
     [Column("REFERENCE1")]
     public string? Reference1 { get; set; }