Refactor scaler to util #5097

Job	Run time
run-tests (latest, test_prod)	1m 40s
run-tests (latest, test_core)	2m 49s
run-tests (latest, test_cli)	3m 22s
run-tests (latest, test_big_modeling)	3m 36s
run-tests (latest, test_deepspeed)	2m 19s
run-tests (latest, test_fsdp)	2m 17s
run-tests (latest, test_example_differences)	2m 13s
run-tests (latest, test_checkpoint_step)	3m 48s
run-tests (latest, test_checkpoint_epoch)	3m 23s
run-tests (latest, test_rest)	8m 59s
run-tests (minimum, test_prod)	2m 15s
run-tests (minimum, test_core)	3m 34s
run-tests (minimum, test_cli)	3m 21s
run-tests (minimum, test_big_modeling)	4m 1s
run-tests (minimum, test_deepspeed)	3m 3s
run-tests (minimum, test_fsdp)	3m 4s
run-tests (minimum, test_example_differences)	3m 29s
run-tests (minimum, test_checkpoint_step)	4m 40s
run-tests (minimum, test_checkpoint_epoch)	4m 12s
run-tests (minimum, test_rest)	9m 47s
	1h 15m 52s

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