Create end-to-end testing for general use cases of the API: 

1. An API call is successful , and we calls `get_last_error` on it. 
2. An API call (thats not within our converted list of this project) returns an error + a WT log message. Calling `get_last_error` should return the message + a `WT_NONE` sub-level error code
3. An API call (thats not within our converted list of this project) returns an error with no message or sub-level error code attached. Calling `get_last_error` on it should return the last error code seen.