Reapply "Fix loading spinner spacing on child issues and epics"

What does this MR do and why?

Reapply "Fix loading spinner spacing on child issues and epics"

This reverts commit 23928e64 and reintroduces !154467 (merged)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

See !154467 (merged)

How to set up and validate locally

See !154467 (merged)

Related to #452225 (closed)