Improve list of sorting options

What does this MR do?

1. It changes the sorting dropdown items in issuables.
2. It removes no longer needed tests.
3. It updates current tests to match new items in the dropdown.
4. It keeps current sorting items in the backend code and adds new ones (old items are needed for other pages where the sorting is not touched by this MR).

Why was this MR needed?

It improves the UX

Screenshots (if relevant)

Before	After

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• 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

What are the relevant issue numbers?

Closes #36929 (closed)