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

Dto/Deployment/Get/GetQueueJobTargetDto.cs

@@ -8,6 +8,9 @@
         public string Status { get; set; } = string.Empty;
         public int Attempts { get; set; }
         public string? ErrorMessage { get; set; }
+        public DateTime? Started { get; set; }
+        public DateTime? Finished { get; set; }
+        public string? OutputMetadataJson { get; set; }
     }
 }