Summary: `YGConfigContext` was using `global_ref` instances for the config, leading to the config object never being freed. Since we no longer need it after getting rid of cloning, we can make the context a pointer to a `global_ref` to the logger.
Reviewed By: SidharthGuglani
Differential Revision: D14258571
fbshipit-source-id: cce632499839a680eef00a3854f61ab74ae2a87a