Kubernetes executor ignores Docker ENTRYPOINT for the runner helper image
## Release notes The GitLab Runner [Kubernetes executor](https://docs.gitlab.com/runner/executors/kubernetes.html) build and helper image now honors `entrypoint` and works with `exec "$@"` which is typically used to make the entry point a passthrough to run the docker command. ## Overview In https://gitlab.com/gitlab-org/gitlab-runner/-/issues/4125 we addressed the issue with the Kubernetes executor ignoring Docker Entrypoint. However, as mentioned in this [comment](https://gitlab.com/gitlab-org/gitlab-runner/-/issues/4125#note_802121846), we did not address the helper image.
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