Remove mean_div_lighthill_tensor operator (#1412)

* Remove mean_div_lighthill_tensor operator

* Update __init__.py

* Also remove import

---------

Co-authored-by: Paul Profizi <[email protected]>

Author: rafacanton

src/ansys/dpf/core/operators/result/__init__.py

@@ -163,7 +163,6 @@
 from .mass_flow_rate import mass_flow_rate 
 from .mass_fraction import mass_fraction 
 from .material_property_of_element import material_property_of_element 
-from .mean_div_lighthill_tensor import mean_div_lighthill_tensor 
 from .mean_static_pressure import mean_static_pressure 
 from .mean_temperature import mean_temperature 
 from .mean_velocity import mean_velocity