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Replace std::env::{set,remove}_var (unsafe + racy under parallel test
execution in edition 2024) with a read-only PATH lookup. Preserves all
three behaviors under test and drops the #[allow(unsafe_code)].
(cherry picked from commit ac5766eeab2db4e8cc6fcd8d8a97809edaf3df30)
Signed-off-by: Jamie King <jamiek@nvidia.com>