## Changes
The APIs at Databricks when returning a non `200` status code will
return a response body of the format:
```
{
"error_code": "Error code",
"message": "Human-readable error message."
}
```
This PR adds the ability to stub non-200 status codes in the test
server, allowing us to mock API errors from Databricks.
## Tests
New test
shreyas-goenka