Add AsciiDoc snippet for CI/CD Badges

What does this MR do?

Add an AsciiDoc snippet for CI/CD Badges (#26087 (closed)).

Are there points in the code the reviewer needs to double check?

I can't get the snippet to be highlighted properly. It seems as if Rouge does not support AsciiDoc (https://github.com/jneen/rouge/issues/595), and this is what is being used for the highlighting if I am not mistaken. I might be completely wrong here though, as I'm still quite overwhelmed by the GitLab source. So I'd really appreciate if the reviewer could take a deeper look into it and guide me there.

Why was this MR needed?

New Feature as described in #26087 (closed)

Screenshots (if relevant)

Before

After

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated (not needed?)
• API support added (not needed?)
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #26087 (closed)