Remove unused user_selects in Project settings

What does this MR do and why?

Removes the unused user_select import in project settings

Screenshots or screen recordings

No visual changes are expected.

before	after

How to set up and validate locally

Dropdowns in Project Settings should still work as expected.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #369998 (closed)