Add a tooltip on the Premium badge

What does this MR do and why?

Adds a "Premium and Ultimate" tooltip on the "Premium" badge. This is similar to the tooltip we have on the Free badge, which has a "Free, Premium, and Ultimate" tooltip.

Screenshots, screen recordings, or links to review app

Examples on the review app:

• https://sarahgerman-main-patch-83426.docs.gitlab-review.app/ee/ci/examples/#adding-templates-to-your-gitlab-installation
• https://sarahgerman-main-patch-83426.docs.gitlab-review.app/ee/administration/operations/fast_ssh_key_lookup.html#fast-lookup-is-required-for-geo

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Configure a local GitLab Docs environment: https://gitlab.com/gitlab-org/gitlab-docs/-/blob/main/doc/setup.md.
2. View a page that has a Premium badge, and hover over it to see the tooltip. Here's one: https://sarahgerman-main-patch-83426.docs.gitlab-review.app/ee/ci/examples/#adding-templates-to-your-gitlab-installation

Merge request acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this merge request.