EP enable running PL with graph API (#1814)

Summary:
Pull Request resolved: #1814

## What

- Add call to `run_study` when the a PLGraphAPIExperiment is specified

## Why

- So that we can run PL graph API experiments

## What is this diff stack

- I am introducing the ability to configure and execute PL and PA graph API experiments on the experimentation platform
- See [high level doc](https://docs.google.com/document/d/1BK8qBvl7z-gZ6WzdFyPBWSKO1tp8wUMxmOPFoTkEgyo/edit)
- See [doc on configurability changes](https://docs.google.com/document/d/1pAdho-D_iXzpuh6Y5pOrP6FLfpkIxYilztNJp5GP9xI/edit#heading=h.iduazwf5vrr9)

Reviewed By: nguytc, yanglu-fb

Differential Revision: D40453810

fbshipit-source-id: 28e685ce132eb5c41e31b4cc13b809731b7d8444

fbpcs/pl_coordinator/bolt_graphapi_client.py

@@ -239,7 +239,6 @@ def _get_graph_api_token(self, config: Dict[str, Any]) -> str:
             token = os.getenv(FBPCS_GRAPH_API_TOKEN)
             if not token:
                 no_token_exception = GraphAPITokenNotFound.make_error()
-                self.logger.exception(no_token_exception)
                 raise no_token_exception from None
             self.logger.info(
                 f"successfully read graph api token from {FBPCS_GRAPH_API_TOKEN} env var"