Enables ordering subgroups by name in the web interface

What does this MR do?

Enables ordering subgroups by name in the web interface

Also, drys up the surrounding code a little bit

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

There are no tests

Why was this MR needed?

Ordering of groups has possible, ordering of subgroups is not (#36958) Ordering projects by name was possible, ordering groups by name is not (#24962 (moved))

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

Closes #24962 (moved), #36958