UsersController#projects.json sort order

What does this MR do?

Specifies the sort order by updated_at of the projects shown in UsersController#projects.json.

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

No.

Why was this MR needed?

It is not useful that UsersController#projects.json currently shows projects in reverse order by created_at (id).

Screenshots (if relevant)

before	after
sorted by created_at:	sorted by updated_at:

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
• [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 #45065 (closed)