Handle LDAP user photo when account is no longer in AD

[Cold-FR]

Problem

When an LDAP user account that previously had a photo is removed from Active Directory (AD), there may still be references or photos present in the system. This can result in orphaned photos or inconsistent state in NexTrombi-AD for users that are no longer active.

Expected behavior

• LDAP user photos should be properly handled when their account is no longer present in AD.
• Orphaned photos should be cleaned up or flagged appropriately.
• The application should not display or retain photos for users not present in AD.

Steps to Reproduce

1. Sync a user from LDAP to NexTrombi-AD with a photo.
2. Remove the user from AD.
3. Observe the photo data/state in NexTrombi-AD after the next sync or lookup.

Suggested Solution

• Detect when users with remaining photos no longer exist in AD.
• Remove or archive their photo data.

Additional Context

• This can help keep user data accurate and comply with privacy or retention standards.