ZelAnton / ProcessKit-rs / 29088846091

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Settle the trap before signalling in matching_identity_group_is_kept_and_signalled

The test spawned `sh -c "trap '' TERM; while :; do :; done"` and sent
SIGTERM immediately after confirming the child leads its own group, with
no window for the shell to actually execute the trap builtin first. A
SIGTERM landing before the trap is installed kills the child under its
still-default disposition, which this test's load-bearing assertion
(the child stays alive, having trapped the signal) then reports as a
failure — unlike the sibling recycled-pid tests in this file, whose
load-bearing assertion is only the prune, not liveness, so the same race
doesn't surface there.

escalate_false_does_not_kill_survivors already guards the identical
spawn pattern with a 50ms settle sleep before signalling; apply the same
fix here. Seen failing intermittently on macOS CI runners (three
consecutive reproductions across default, all-features and
no-default-features feature configs) since T-089 introduced this test.

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14913 of 15812 relevant lines covered (94.31%)

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