gateway changes (#20304)

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

Content.Shared/Teleportation/Systems/LinkedEntitySystem.cs

@@ -1,6 +1,7 @@
-using System.Linq;
 using Content.Shared.Teleportation.Components;
 using Robust.Shared.GameStates;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
 
 namespace Content.Shared.Teleportation.Systems;
 
@@ -113,5 +114,25 @@ public sealed class LinkedEntitySystem : EntitySystem
         return success;
     }
 
+    /// <summary>
+    /// Get the first entity this entity is linked to.
+    /// If multiple are linked only the first one is picked.
+    /// </summary>
+    public bool GetLink(EntityUid uid, [NotNullWhen(true)] out EntityUid? dest, LinkedEntityComponent? comp = null)
+    {
+        dest = null;
+        if (!Resolve(uid, ref comp, false))
+            return false;
+
+        var first = comp.LinkedEntities.FirstOrDefault();
+        if (first != default)
+        {
+            dest = first;
+            return true;
+        }
+
+        return false;
+    }
+
     #endregion
 }