[BE][FE] Add LDAP user filter + badge on the users page

• On the /admin/users page add a LDAP badge if the user is synced through LDAP sync
• And allow filtering for LDAP users as well.
• This page will be used by the View LDAP synced users button as well

https://gitlab.com/-/project/278964/uploads/c5353499ff0a40965d2d92e0a69e9ecd/Screenshot_2025-03-14_at_4.40.52_PM.png