expert parallelism config in base rollout #4182

Job	Run time
Build tunix package / Build Tunix wheel	11s
tunix_cpu_unit_tests / run	1m 19s
tunix_tpu_unit_tests / run_dev	22m 39s
tunix_tpu_unit_tests / run_prod	11m 34s
Notify failed build	4s
	35m 47s

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