Align MapStorageProvider with the changes in LDAP/Kerberos integration

### Description

There is PR https://github.com/keycloak/keycloak/pull/22531, which contains some changes in the legacy storage in the `UserStorageManager` related to improvements for LDAP/Kerberos integration.

This task is to add those changes also to `MapStorageProvider`. It can be possible to do this together with https://github.com/keycloak/keycloak/pull/10700 (or after that PR is merged).