[CHANGE] Reworked ExtendedBackgroundService.cs with State logic and actions

Manager.Data/Entities/ApplicationContext/WorkItemEntity.cs

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+namespace Manager.Data.Entities.ApplicationContext;
+
+public class WorkItemEntity : DateTimeBase
+{
+    public required Guid Id { get; set; }
+    public required string Name { get; set; }
+    public required string Description { get; set; }
+    public WorkStatus Status { get; set; } = WorkStatus.Pending;
+    public required string ClientId { get; set; }
+}

Manager.Data/Entities/ApplicationContext/WorkStatus.cs

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+namespace Manager.Data.Entities.ApplicationContext;
+
+public enum WorkStatus
+{
+    Pending = 0,
+    InProgress = 1,
+    Paused = 2,
+    Completed = 3,
+    Faulted = 4,
+}