Remove some more unused fields

Content.Shared/Gravity/GravityComponent.cs

@@ -54,7 +54,7 @@ namespace Content.Shared.Gravity
         }
 
         [Serializable, NetSerializable]
-        protected sealed class GravityComponentState : ComponentState
+        private sealed class GravityComponentState : ComponentState
         {
             public bool Enabled { get; }
 

Content.Shared/Interaction/SharedInteractionSystem.cs

@@ -19,7 +19,6 @@ namespace Content.Shared.Interaction
     public abstract class SharedInteractionSystem : EntitySystem
     {
         [Dependency] private readonly SharedPhysicsSystem _sharedBroadphaseSystem = default!;
-        [Dependency] private readonly SharedPopupSystem _popupSystem = default!;
 
         public const float InteractionRange = 2;
         public const float InteractionRangeSquared = InteractionRange * InteractionRange;

Content.Shared/Pulling/Components/PullableComponent.cs

@@ -21,9 +21,6 @@ namespace Content.Shared.Pulling.Components
     {
         public override string Name => "Pullable";
 
-        // At this point this field exists solely for the component dependency (which is mandatory).
-        [ComponentDependency] private readonly PhysicsComponent? _physics = default!;
-
         public float? MaxDistance => PullJoint?.MaxLength;
 
         /// <summary>