Cleanup actor handle pickling code (#3560)
Cleanup actor handle pickling code (#3560)

* Cleanup actor handle pickling code

* remove unused

* fix

* lint

atumanov/ray,atumanov/ray,ray-project/ray,robertnishihara/ray,pcmoritz/ray-1,ray-project/ray,stephanie-wang/ray,ray-project/ray,atumanov/ray,ujvl/ray-ng,stephanie-wang/ray,pcmoritz/ray-1,richardliaw/ray,ray-project/ray,ujvl/ray-ng,pcmoritz/ray-1,ray-project/ray,richardliaw/ray,richardliaw/ray,robertnishihara/ray,pcmoritz/ray-1,richardliaw/ray,ray-project/ray,richardliaw/ray,richardliaw/ray,atumanov/ray,stephanie-wang/ray,ray-project/ray,stephanie-wang/ray,richardliaw/ray,robertnishihara/ray,robertnishihara/ray,ujvl/ray-ng,atumanov/ray,ray-project/ray,richardliaw/ray,atumanov/ray,stephanie-wang/ray,stephanie-wang/ray,robertnishihara/ray,pcmoritz/ray-1,pcmoritz/ray-1,atumanov/ray,stephanie-wang/ray,atumanov/ray,stephanie-wang/ray,robertnishihara/ray,robertnishihara/ray,robertnishihara/ray,pcmoritz/ray-1,robertnishihara/ray,stephanie-wang/ray,ujvl/ray-ng,pcmoritz/ray-1