DoAfter Refactor (#13225)

Co-authored-by: DrSmugleaf <drsmugleaf@gmail.com>

Content.Server/Chemistry/Components/InjectorComponent.cs

@@ -1,4 +1,3 @@
-using System.Threading;
 using Content.Shared.Chemistry.Components;
 using Content.Shared.FixedPoint;
 
@@ -63,12 +62,6 @@ namespace Content.Server.Chemistry.Components
         [DataField("delay")]
         public float Delay = 5;
 
-        /// <summary>
-        ///     Token for interrupting a do-after action (e.g., injection another player). If not null, implies
-        ///     component is currently "in use".
-        /// </summary>
-        public CancellationTokenSource? CancelToken;
-
         [DataField("toggleState")] private InjectorToggleMode _toggleState;
 
         /// <summary>