Remove INodeGroupManager, moves logic into NodeGroupSystem.

It was an absolutely redundant IoC service.

Content.Server/GameObjects/EntitySystems/NodeGroupSystem.cs

@@ -1,19 +1,30 @@
-using Content.Server.GameObjects.Components.NodeContainer.NodeGroups;
+using System.Collections.Generic;
+using Content.Server.GameObjects.Components.NodeContainer.NodeGroups;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
 
 namespace Content.Server.GameObjects.EntitySystems
 {
     [UsedImplicitly]
     public class NodeGroupSystem : EntitySystem
     {
-        [Dependency] private readonly INodeGroupManager _groupManager = default!;
+        private readonly HashSet<INodeGroup> _dirtyNodeGroups = new();
+
+        public void AddDirtyNodeGroup(INodeGroup nodeGroup)
+        {
+            _dirtyNodeGroups.Add(nodeGroup);
+        }
 
         public override void Update(float frameTime)
         {
             base.Update(frameTime);
-            _groupManager.Update(frameTime);
+
+            foreach (var group in _dirtyNodeGroups)
+            {
+                group.RemakeGroup();
+            }
+
+            _dirtyNodeGroups.Clear();
         }
     }
 }