title: Hide users with a specific role from users list on WordPress admin dashboard
body: <p>I have two roles called Agent and Subagent.
  I want to hide these two specific roles from the admin user list.</p>
  <p>I tried using the <code>pre_user_query</code> filter but couldn't get it to work.</p>
  <p>Could anyone please suggest a correct way to do it?</p>
  <p>Thanks,</p>