fix(user_ldap): retrieve from LDAP first "email shaped" value instead…

[Thatoo]

• Resolves: [Bug]: LDAP Advance > Special attributes > email field should take first "email shaped" value, not first value of LDAP answer. #49177

Summary

Retrieve from LDAP first "email shaped" value instead of first value

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

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