Sync group sidebar template with EE

What does this MR do?

Sync the group sidebar template with EE to avoid conflicts and ee-specific-lines-check failures.

This is the CE backport MR for https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/7974/commits

What are the relevant issue numbers?

gitlab-org/gitlab-ee#6709

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides