Expand scope of "test_mseg_ok_distrib" in MarketUpdatesTest

[jtlangevin]

This test currently ensures that probability distributions on ECM cost, performance, lifetime, and retrofit rate inputs are generating lists of sampled values as intended; however, the test does not run a complete check on the full set of ECM outputs generated by running associated ECM definitions. Future work should expand the test to check the full set of outputs.