Refactor code structure for improved readability and maintainability

Models/DeploymentJobStepModel.cs

@@ -0,0 +1,40 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Microsoft.SelfService.Portal.Core.API.Models
+{
+    public class QueueJobStepModel : BaseModel
+    {
+        [Column(Order = 1)]
+        public Guid QueueJobId { get; set; }
+
+        [Column(Order = 2)]
+        public Guid? DependsOnQueueJobStepId { get; set; }
+
+        [Column(Order = 3)]
+        public int SortOrder { get; set; }
+
+        [Column(Order = 4)]
+        public string Name { get; set; }
+
+        [Column(Order = 5)]
+        public string StepType { get; set; } = QueueJobStepType.Provision;
+
+        [Column(Order = 6)]
+        public string Status { get; set; } = QueueJobStatus.Pending;
+
+        [Column(Order = 7)]
+        public string? MetadataJson { get; set; }
+
+        [Column(Order = 8)]
+        public DateTime? ApprovedAt { get; set; }
+
+        [Column(Order = 9)]
+        public string? ApprovedBy { get; set; }
+
+        [Column(Order = 10)]
+        public string? ApprovalComment { get; set; }
+
+        public QueueJobModel QueueJob { get; set; }
+        public QueueJobStepModel? DependsOnQueueJobStep { get; set; }
+    }
+}