Cleaning up our navigational order - Groups

What does this MR do?

Covers Group nav changes from #26348 (closed)

Why was this MR needed?

See meta issue #25386 (closed) and the related issue #26348 (closed)

Screenshots

Group tab - GitLab CE

Group tab - GitLab EE

Issues tab - GitLab CE/EE

Merge Requests tab - GitLab CE/EE

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated
• API support added
• 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?

See #26348 (closed)