List previous file versions for legal hold policy assignment

Get a list of previous file versions for a legal hold assignment. In some cases you may only need the latest file versions instead. In these cases, use the `GET /legal_hold_policy_assignments/:id/files_on_hold` API instead to return any current (latest) versions of a file for this legal hold policy assignment. Due to ongoing re-architecture efforts this API might not return all files held for this policy ID. Instead, this API will only return past file versions held in the newly developed ...