Fix: Use case in-sensitive ordering by name for groups

What does this MR do?

Makes the order for groups listing by name on the dashboard for /dashboard/groups?sort=name_asc case-insensitive

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

• Current behaviour for /projects?sort=name_asc is also case-sensitive ie. follows the order AA BB CC aa bb cc
• Should the fix instead be for name column for all entities that include Sortable instead? ie. here
• This is my first MR to gitlab-ce. Please check if I wrongly marked any of the acceptance criteria as [n/a]

Why was this MR needed?

As a fix for the open issue

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [n/a] Documentation created/updated
• API support added
• 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
• [n/a] Internationalization required/considered
• [n/a] End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Closes #45617

Screenshots for sorting groups after this patch

sorted_by_name_asc

sorted_by_name_desc

sorted_by_last_created