CPU tests

Use tinystories in `pretrain/debug.yaml` #3649

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Run time

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Job	Run time
cpu-tests (macOS-12, 3.10)	6m 33s
cpu-tests (ubuntu-22.04, 3.11)	3m 49s
cpu-tests (ubuntu-22.04, 3.10)	6m 46s
cpu-tests (ubuntu-22.04, 3.9)	4m 11s
cpu-tests (ubuntu-20.04, 3.8)	7m 46s
cpu-tests (windows-2022, 3.10)	6m 52s
	35m 57s