build

Move v1 benchmark files into a subfolder. #42803

Job	Run time
build-checkpoint (Python 3.10, jax=0.6.0)	4m 18s
build-export (Python 3.12, jax=newest)	2m 20s
build-checkpoint (Python 3.10, jax=newest)	5m 4s
build-orbax-model (Python 3.10, jax=newest)	53s
build-export (Python 3.10, jax=newest)	2m 10s
build-export (Python 3.10, jax=0.4.34)	3m 27s
multiprocess-checkpoint-benchmarks (Python 3.10, jax=0.6.0)	15m 31s
build-checkpoint (Python 3.11, jax=newest)	4m 11s
build-export (Python 3.11, jax=newest)	2m 16s
build-orbax-model (Python 3.12, jax=newest)	58s
build-orbax-model (Python 3.10, jax=0.5.0)	47s
build-checkpoint (Python 3.12, jax=newest)	4m 23s
multiprocess-unit-tests (Python 3.11, jax=newest)	8m 53s
build-orbax-model (Python 3.11, jax=newest)	56s
	56m 7s

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