[BEAM-11483] Ignore windowed GBK tests in Spark portable streaming.
[BEAM-11483] Ignore windowed GBK tests in Spark portable streaming.

see also BEAM-10784

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