Un-revert IPlayerManager refactor (#21244)

Content.Client/CharacterInfo/CharacterInfoSystem.cs

@@ -1,6 +1,5 @@
 using Content.Shared.CharacterInfo;
 using Content.Shared.Objectives;
-using Robust.Client.GameObjects;
 using Robust.Client.Player;
 using Robust.Client.UserInterface;
 
@@ -11,14 +10,11 @@ public sealed class CharacterInfoSystem : EntitySystem
     [Dependency] private readonly IPlayerManager _players = default!;
 
     public event Action<CharacterData>? OnCharacterUpdate;
-    public event Action? OnCharacterDetached;
 
     public override void Initialize()
     {
         base.Initialize();
 
-        SubscribeLocalEvent<PlayerAttachSysMessage>(OnPlayerAttached);
-
         SubscribeNetworkEvent<CharacterInfoEvent>(OnCharacterInfoEvent);
     }
 
@@ -33,14 +29,6 @@ public sealed class CharacterInfoSystem : EntitySystem
         RaiseNetworkEvent(new RequestCharacterInfoEvent(GetNetEntity(entity.Value)));
     }
 
-    private void OnPlayerAttached(PlayerAttachSysMessage msg)
-    {
-        if (msg.AttachedEntity == default)
-        {
-            OnCharacterDetached?.Invoke();
-        }
-    }
-
     private void OnCharacterInfoEvent(CharacterInfoEvent msg, EntitySessionEventArgs args)
     {
         var entity = GetEntity(msg.NetEntity);