Improved the exception handling in the execution strategies. (#1551)

Closes
SoftUni-Internal/exam-systems-issues#1664

Author: deyordanov

Data/OJS.Data.Models/Submissions/Submission.cs

@@ -51,6 +51,8 @@ public class Submission : DeletableAuditInfoEntity<int>
         [StringLength(ConstraintConstants.Submission.WorkerNameMaxLength)]
         public string? WorkerName { get; set; }
 
+        public ExceptionType? ExceptionType { get; set; }
+
         [NotMapped]
         public bool IsBinaryFile => !string.IsNullOrWhiteSpace(this.FileExtension);