Revert "Persist ghprbPullId parameter in seed job (#22579)" (#22656)
Revert "Persist ghprbPullId parameter in seed job (#22579)" (#22656)

This reverts commit 4799828f75309fd494e14eab5af40559e9a140a3.
apache/beam,chamikaramj/beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam,apache/beam,lukecwik/incubator-beam,chamikaramj/beam,apache/beam,chamikaramj/beam,apache/beam,chamikaramj/beam,lukecwik/incubator-beam,chamikaramj/beam,apache/beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam,chamikaramj/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,apache/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,apache/beam,lukecwik/incubator-beam,chamikaramj/beam,apache/beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam