Pullability partial ECS refactor, monkey-gibbing error fix (#4695)

* Migrate lots of pulling logic out of the components and clean it up

* It's buggy, but move more code out of the pullable component

* Pulling system now throws less errors than it did before the refactor

* Finally finish the big parts of refactoring pullability

* Pulling: Handle disconnect properly if the pull joint has been removed by physics shutdown

* Port 2b68449328 to this branch

* Changes as per PR reviews

* Port e801ffac45 (SharedJointSystem) and fix issues encountered during testing

SharedJointSystem.

Also, MinLength and Stiffness appear to have suddenly gained enough meaning that pulling is broken unless they're set.

Content.Shared/Pulling/Systems/SharedPullableSystem.cs

@@ -9,6 +9,7 @@ namespace Content.Shared.Pulling.Systems
     public class SharedPullableSystem : EntitySystem
     {
         [Dependency] private readonly ActionBlockerSystem _blocker = default!;
+        [Dependency] private readonly SharedPullingSystem _pullSystem = default!;
 
         public override void Initialize()
         {
@@ -20,7 +21,7 @@ namespace Content.Shared.Pulling.Systems
         {
             var entity = args.Session.AttachedEntity;
             if (entity == null || !_blocker.CanMove(entity)) return;
-            component.TryStopPull();
+            _pullSystem.TryStopPull(component);
         }
     }
 }