LDAP: Fix LDAP users authenticated via auth proxy not being able to use LDAP active sync (#83715)
* fix LDAP users authenticated via auth proxy not being able to use ldap sync
* simplify id resolution at the cost of no fallthrough
* remove unused services
* remove unused cache key
(cherry picked from commit 2182cc47ac)
Co-authored-by: Jo <joao.guerreiro@grafana.com>
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