The bash scripts are deprecated and only used when someone specified a
`helper_image` in `[runners.docker]`. In 12.0 we are going to remove any support for the old
bash scripts in favor of the new Go commands.

The new Go commands were introduced for
gitlab-org/gitlab-runner#3755 for the
following merge requests:
- gitlab-org/gitlab-runner!1195
- gitlab-org/gitlab-runner!1201
- gitlab-org/gitlab-runner!1218

Update `TestDockerCommandWithHelperImageConfig` to use one of the latest
image that has the new commands, since the tag that is being used does
not have the new commands which leads into a build failure.

closes gitlab-org/gitlab-runner#4013