[BEAM-8294] run Spark portable validates runner tests in parallel
[BEAM-8294] run Spark portable validates runner tests in parallel

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