Similar to other tests who set a failpoint on the config server primary, refine_collection_shard_key_atomic.js should not run in the sharding_csrs_continuous_config_stepdown suite

refine_collection_shard_key_atomic.js sets the failpoint hangRefineCollectionShardKeyBeforeCommit on the config server primary. 

If the config server primary steps down, and a new primary steps up and successfully refines the shard key, the failpoint will never get hit.