Code Cleanup: Purge obsolete MapManager methods (#26279)

* GetGrid

* GridExists

* TryGetGrid

Content.Server/NodeContainer/EntitySystems/NodeGroupSystem.cs

@@ -8,7 +8,7 @@ using Content.Shared.NodeContainer;
 using JetBrains.Annotations;
 using Robust.Server.Player;
 using Robust.Shared.Enums;
-using Robust.Shared.Map;
+using Robust.Shared.Map.Components;
 using Robust.Shared.Player;
 using Robust.Shared.Utility;
 
@@ -25,7 +25,6 @@ namespace Content.Server.NodeContainer.EntitySystems
         [Dependency] private readonly IAdminManager _adminManager = default!;
         [Dependency] private readonly INodeGroupFactory _nodeGroupFactory = default!;
         [Dependency] private readonly ILogManager _logManager = default!;
-        [Dependency] private readonly IMapManager _mapManager = default!;
 
         private readonly List<int> _visDeletes = new();
         private readonly List<BaseNodeGroup> _visSends = new();
@@ -343,7 +342,7 @@ namespace Content.Server.NodeContainer.EntitySystems
         private IEnumerable<Node> GetCompatibleNodes(Node node, EntityQuery<TransformComponent> xformQuery, EntityQuery<NodeContainerComponent> nodeQuery)
         {
             var xform = xformQuery.GetComponent(node.Owner);
-            _mapManager.TryGetGrid(xform.GridUid, out var grid);
+            TryComp<MapGridComponent>(xform.GridUid, out var grid);
 
             if (!node.Connectable(EntityManager, xform))
                 yield break;