Use pre-packaged k8s tools when available instead of downloading

What does this MR do?

Switch to image with built-in k8s tools ( Add k8s tooling to CNG build images (gitlab-org/gitlab-build-images!471 - merged) )

Related issues

Closes #3051 (closed)

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion.

Required

• Merge Request Title and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA
• Equivalent MR/issue for omnibus-gitlab opened