Add LDAP & custom role badge & filter to users page

What does this MR do and why?

• Adds a LDAP badge and filter on the Admin > Users page to get a list of users synced via LDAP.

References

Screenshots or screen recordings

Screen_Recording_2025-04-23_at_11.12.25_am

How to set up and validate locally

1. Log-in as an admin and ensure you are on an Ultimate license. Then, navigate to /admin/users/
2. Pick any existing user, and create an LDAP identity for that user:

Identity.create(user: <USER>, extern_uid: "uid=group-a,ou=people,dc=example,dc=com", provider: "ldapmain")

4. Refresh the page. Filter the users by LDAP Sync = True. You should be able to see that user with an LDAP badge.

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #534310 (closed)