Added codebase from private repo

What does this MR do and why?

This MR copies the infra code from the private repo to this new public repo. The removal of this code from the private repo will be a separate MR.

It also adds a basic .gitlab-ci.yml to:

• Add Danger review
• Check for a new Chart version
• Auto-generate release tag with a changelog.

I have noted the files that have been changed, all other files are direct copies.

Related to https://gitlab.com/gitlab-org/analytics-section/product-analytics/analytics-stack/-/issues/133