[pallas/pallas_mgpu] Discharging run_scoped should not be discharging the intermediates #69312

Job	Run time
build with 3.10 (py 3.10 on ubuntu-20.04, x64=1)	10m 8s
build with 3.13 (py 3.13 on ubuntu-20.04, x64=0)	6m 33s
Documentation - test code snippets (3.10)	1m 29s
Documentation - render documentation (3.10)	3m 1s
FFI example	2m 27s
jax2tf_test (py 3.10 on ubuntu-latest, x64=0)	1m 23s
lint_and_typecheck	1m 13s
	26m 14s

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