Automatic merge from submit-queue (batch tested with PRs 57973, 57990). 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>.
Fix RunAsUserId validation
Use validation.IsValidUserID to properly check for valid UserId in RunAsUser field of SecurityContext.
release-note NONE