Add queue hardening by modifying DeploymentJobTargets, DeploymentJobSteps, and DeploymentJobs tables

- Drop existing indexes on DeploymentJobTargets and DeploymentJobSteps
- Alter Status column to nvarchar(450) in DeploymentJobTargets, DeploymentJobSteps, and DeploymentJobs
- Add new columns: Finished, OutputMetadataJson, Started to DeploymentJobTargets; ErrorMessage, Finished, OutputMetadataJson, Started to DeploymentJobSteps; CorrelationId, HeartbeatAt, Priority, RowVersion, ScheduledAt, WorkerName to DeploymentJobs
- Create new indexes for improved query performance
- Add constraints to ensure OutputMetadataJson is valid JSON
- Record migration in __EFMigrationsHistory

Models/DeploymentJobModel.cs

@@ -1,5 +1,7 @@
 using System.ComponentModel.DataAnnotations.Schema;
 
+using System.ComponentModel.DataAnnotations;
+
 namespace Microsoft.SelfService.Portal.Core.API.Models
 {
     public class QueueJobModel : BaseModel
@@ -40,6 +42,24 @@ namespace Microsoft.SelfService.Portal.Core.API.Models
         [Column(Order = 12)]
         public string? RuleSnapshotJson { get; set; }
 
+        [Column(Order = 13)]
+        public Guid CorrelationId { get; set; } = Guid.NewGuid();
+
+        [Column(Order = 14)]
+        public int Priority { get; set; } = 100;
+
+        [Column(Order = 15)]
+        public DateTime? ScheduledAt { get; set; }
+
+        [Column(Order = 16)]
+        public DateTime? HeartbeatAt { get; set; }
+
+        [Column(Order = 17)]
+        public string? WorkerName { get; set; }
+
+        [Timestamp]
+        public byte[] RowVersion { get; set; } = [];
+
         public ICollection<QueueJobTargetModel> Targets { get; set; } = new List<QueueJobTargetModel>();
         public ICollection<QueueJobStepModel> Steps { get; set; } = new List<QueueJobStepModel>();
     }