Automatic merge from submit-queue (batch tested with PRs 53474, 54258, 54356). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Directly using std{in,out} for test helper subproc **What this PR does / why we need it** This fixes one TODO in the code of a test helper and is an extremely minor improvement **Which issue this PR fixes** Fixes issue #54258 **Special notes for your reviewer** I'm using this to familiarize myself with the Kubernetes contribution process while being helpful in the process. ```release-note NONE ```