E.g. a failed `KillSandboxee` for a timeout would already set the exit status code while there could be an external kill pending at the same time which would try to `KillSandboxee` again and thus set exit status code again.
PiperOrigin-RevId: 448464765
Change-Id: Ic5744a576c4255504bfb1d5c4f33253b5bb32b6f