Objectives ecs rework (#19967)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/Objectives/Systems/NotJobRequirementSystem.cs

@@ -0,0 +1,31 @@
+using Content.Server.Objectives.Components;
+using Content.Shared.Objectives.Components;
+using Content.Shared.Roles.Jobs;
+
+namespace Content.Server.Objectives.Systems;
+
+/// <summary>
+/// Handles checking the job blacklist for this objective.
+/// </summary>
+public sealed class NotJobRequirementSystem : EntitySystem
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<NotJobRequirementComponent, RequirementCheckEvent>(OnCheck);
+    }
+
+    private void OnCheck(EntityUid uid, NotJobRequirementComponent comp, ref RequirementCheckEvent args)
+    {
+        if (args.Cancelled)
+            return;
+
+        // if player has no job then don't care
+        if (!TryComp<JobComponent>(args.MindId, out var job))
+            return;
+
+        if (job.PrototypeId == comp.Job)
+            args.Cancelled = true;
+    }
+}