[BEAM-6978] Disable SDF testing for Dataflow using portability. (#8261)
[BEAM-6978] Disable SDF testing for Dataflow using portability. (#8261)

It was an accident that it worked but wasn't too spec so disabling the test category.
RyanSkraba/beam,apache/beam,robertwb/incubator-beam,robertwb/incubator-beam,chamikaramj/beam,lukecwik/incubator-beam,RyanSkraba/beam,chamikaramj/beam,robertwb/incubator-beam,lukecwik/incubator-beam,apache/beam,RyanSkraba/beam,chamikaramj/beam,markflyhigh/incubator-beam,markflyhigh/incubator-beam,lukecwik/incubator-beam,RyanSkraba/beam,chamikaramj/beam,robertwb/incubator-beam,markflyhigh/incubator-beam,markflyhigh/incubator-beam,lukecwik/incubator-beam,markflyhigh/incubator-beam,iemejia/incubator-beam,chamikaramj/beam,apache/beam,markflyhigh/incubator-beam,robertwb/incubator-beam,chamikaramj/beam,apache/beam,robertwb/incubator-beam,RyanSkraba/beam,iemejia/incubator-beam,apache/beam,apache/beam,lukecwik/incubator-beam,robertwb/incubator-beam,lukecwik/incubator-beam,apache/beam,robertwb/incubator-beam,chamikaramj/beam,apache/beam,apache/beam,chamikaramj/beam,markflyhigh/incubator-beam,robertwb/incubator-beam,RyanSkraba/beam,RyanSkraba/beam,lukecwik/incubator-beam,apache/beam,lukecwik/incubator-beam,robertwb/incubator-beam,chamikaramj/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam