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Stack from ghstack (oldest at bottom):
Libraries should never create tokio runtimes; that should be up to the caller to manage.
Seems that we were doing this because pyo3 threads did not have the runtime context properly set. So just fix that and zap this runtime. This cuts the number of threads we spawn in the PythonActor by a lot.
Differential Revision: D77422927
NOTE FOR REVIEWERS: This PR has internal Meta-specific changes or comments, please review them on Phabricator!