[Revert] Reverts Ninja (#15516)

* Revert "[Antag] add space ninja as midround antag (#14069)"

This reverts commit c1cda0dbf8.

* Revert "[Fix] move ninja objectives into NinjaRole (#15490)"

This reverts commit 251f429fb3.

Content.Server/Doors/Systems/DoorSystem.cs

@@ -266,8 +266,6 @@ public sealed class DoorSystem : SharedDoorSystem
             {
                 SetState(uid, DoorState.Emagging, door);
                 PlaySound(uid, door.SparkSound, AudioParams.Default.WithVolume(8), args.UserUid, false);
-                var emagged = new DoorEmaggedEvent(args.UserUid);
-                RaiseLocalEvent(uid, ref emagged);
                 args.Handled = true;
             }
         }
@@ -302,12 +300,3 @@ public sealed class DoorSystem : SharedDoorSystem
     }
 }
 
-public sealed class PryFinishedEvent : EntityEventArgs { }
-public sealed class PryCancelledEvent : EntityEventArgs { }
-
-/// <summary>
-/// Event raised when a door is emagged, either with an emag or a Space Ninja's doorjack ability.
-/// Used to track doors for ninja's objective.
-/// </summary>
-[ByRefEvent]
-public readonly record struct DoorEmaggedEvent(EntityUid UserUid);