Fix error when disconnecting the client while a projectile is embedded (#36048)

* Add test for disconnecting the client while a projectile is embedded

* Add check for non-terminating grid or map

* Add test that an embeddable detaches when the target is deleted.

* Remove Explicit tag from TestDisconnectWhileEmbedded

Content.Shared/Projectiles/SharedProjectileSystem.cs

@@ -143,6 +143,8 @@ public abstract partial class SharedProjectileSystem : EntitySystem
         }
 
         var xform = Transform(uid);
+        if (TerminatingOrDeleted(xform.GridUid) && TerminatingOrDeleted(xform.MapUid))
+            return;
         TryComp<PhysicsComponent>(uid, out var physics);
         _physics.SetBodyType(uid, BodyType.Dynamic, body: physics, xform: xform);
         _transform.AttachToGridOrMap(uid, xform);