[BEAM-11324] Impose consistent ordering on partitionings used in PartitioningSession (#13854)
[BEAM-11324] Impose consistent ordering on partitionings used in PartitioningSession (#13854)

* Impose consistent orderign on partitionings used in PartitioningSession

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