Werk #17421: LDAP: Catch incorrectly configured roles group dn in the schema

Component	REST API
Title	LDAP: Catch incorrectly configured roles group dn in the schema
Date	Jan 14, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.4.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

This change fixes two issues.

1. The group_dn within sync_plugins -> groups_to_roles should endwith the configured group_dn, not be equal to it.
2. We now catch this config error in the request schema instead of raising a ValueError and generating a crash report.

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