[BEAM-8655] Run trigger transcript tests with combiner as well as GroupByKey.
[BEAM-8655] Run trigger transcript tests with combiner as well as GroupByKey.

chamikaramj/beam,apache/beam,robertwb/incubator-beam,apache/beam,apache/beam,robertwb/incubator-beam,lukecwik/incubator-beam,chamikaramj/beam,chamikaramj/beam,robertwb/incubator-beam,RyanSkraba/beam,iemejia/incubator-beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam,lukecwik/incubator-beam,robertwb/incubator-beam,chamikaramj/beam,RyanSkraba/beam,apache/beam,chamikaramj/beam,apache/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,apache/beam,apache/beam,robertwb/incubator-beam,RyanSkraba/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam,robertwb/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam,RyanSkraba/beam,apache/beam,lukecwik/incubator-beam,iemejia/incubator-beam,chamikaramj/beam,robertwb/incubator-beam,RyanSkraba/beam,lukecwik/incubator-beam,RyanSkraba/beam,chamikaramj/beam,chamikaramj/beam,apache/beam,chamikaramj/beam,apache/beam,RyanSkraba/beam,robertwb/incubator-beam