EntityLookup as a system for content (#6931)

Content.Client/Outline/TargetOutlineSystem.cs

@@ -14,7 +14,7 @@ namespace Content.Client.Outline;
 public sealed class TargetOutlineSystem : EntitySystem
 {
     [Dependency] private readonly IEyeManager _eyeManager = default!;
-    [Dependency] private readonly IEntityLookup _lookup = default!;
+    [Dependency] private readonly EntityLookupSystem _lookup = default!;
     [Dependency] private readonly IInputManager _inputManager = default!;
     [Dependency] private readonly IPlayerManager _playerManager = default!;
     [Dependency] private readonly IPrototypeManager _prototypeManager = default!;