How to check if an op is skipped or successful?

[ivanov-slk]

Previously, a solid had the properties success and skipped that allowed checking for these conditions, e.g. in tests:

result = execute_pipeline(pipeline=my_pipeline,
                                         run_config=my_config)

self.assertTrue(result.success)
self.assertTrue(result.result_for_solid('solid_1').success)
self.assertTrue(result.result_for_solid('solid_2').skipped)

I think that this could be replicated by searching through ExecuteInProcessResult.all_node_events, however this requires some filtering and checking. Is there a more concise way of making the above checks?

[sryza]

@dpeng817