TEZ-1176. Set parallelism should end up sending an update to ATS if numTasks are updated at run-time. (hitesh)

(cherry picked from commit 2600c538886c5864a9248cff04f445cfbde8b203)
TEZ-1658. Additional data generation to Timeline for UI. (hitesh)

(cherry picked from commit 190a74fdc28655f8ca1a3946687aad40c8254ad0)