Remove unused prebuild_sdk_container_base_iamge option from validate container test
Remove unused prebuild_sdk_container_base_iamge option from validate container test

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