Add IT for ResultSetStreamingOutput and update class

Updates the custom MessageBodyWriter to ignore formats that are not handled by Jena:

https://github.com/apache/jena/blob/bc37348521aa016a4481dea74ed884d720001920/jena-arq/src/main/java/com/hp/hpl/jena/query/ResultSetFormatter.java#L347
Since N3 is not supported by the underlying ResultSetFormatter, is there any reason to keep the N3 logic in the `getResultsFormat()` method of this class?