Remove uses of TransformComponent.ChildEntities (#22442)

* Make output of ChildEnumerator non-nullable

* Remove uses of ChildEntities

* poke tests

---------

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/Medical/SuitSensors/SuitSensorSystem.cs

@@ -137,7 +137,7 @@ public sealed class SuitSensorSystem : EntitySystem
                 sensor.StationId = stationUid;
             }
 
-            RecursiveSensor(child.Value, stationUid, sensorQuery, xformQuery);
+            RecursiveSensor(child, stationUid, sensorQuery, xformQuery);
         }
     }