Draft: Move issue items counts to badges

What does this MR do and why?

Moves counts for child and related items on issue page to badges.

Screenshots or screen recordings

Before	After

How to set up and validate locally

Visit an issue page.

MR 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 MR.

Related to #369931 (closed)