[mlir:python] Small optimization to get_op_result_or_results. (#123866)

* We can call .results without figuring out whether we have an Operation
or an OpView, and that's likely the common case anyway.
* If we have one or more results, we can return them directly, with no
need for a call to get_op_result_or_value. We're guaranteed that
.results returns a PyOpResultList, so we have either an OpResult or
sequence of OpResults, just as the API expects.

This saves a few 100ms during IR construction in an LLM JAX benchmark.

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