GA Migration PreCommit and PostCommit Tables in CI.md (#23372)
GA Migration PreCommit and PostCommit Tables in CI.md (#23372)

* adding precommit and postcommit tables

* reflecting inclusion of workflow_dispatch for precommits

* Update CI.md
lukecwik/incubator-beam,lukecwik/incubator-beam,apache/beam,apache/beam,chamikaramj/beam,apache/beam,apache/beam,apache/beam,lukecwik/incubator-beam,chamikaramj/beam,apache/beam,chamikaramj/beam,chamikaramj/beam,apache/beam,chamikaramj/beam,apache/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,lukecwik/incubator-beam,chamikaramj/beam,chamikaramj/beam,apache/beam,lukecwik/incubator-beam,apache/beam,apache/beam,chamikaramj/beam,lukecwik/incubator-beam,chamikaramj/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,chamikaramj/beam