Add git and lfs to cng image

What does this MR do and why?

• Adds git and lfs to cng e2e ci image.
• Move some of the tool versions to variables because we won't require using multiple versions for these

Part of: gitlab-org/quality/quality-engineering/team-tasks#2361 (closed)

Checklist

• (If applicable) Add patches if required for upgrading Ruby version in https://gitlab.com/gitlab-org/gitlab-build-images/-/tree/master/patches/ruby.