LDAP custom users not able to authenticate on control center

Hi all!!

I have deployed a LDAP server and integrate it with Kafka using RBAC. When I try to login on control center with predefined users like Kafka, SR, C3 etc. defined under "dc=ldap,dc=example,dc-com". those are able to login but with custom users defined under "ou=users,dc=ldap,dc=example,dc=com" getting authentication error (invalid username and password).

Here is deployment used to deploy Kafka:
```
apiVersion: platform.confluent.io/v1beta1
kind: Kafka
metadata:
name: kafka
namespace: confluent
spec:
replicas: 3
image:
application: confluentinc/cp-server:7.4.0
init: confluentinc/confluent-init-container:2.6.0
dataVolumeCapacity: 10Gi
tls:
secretRef: tls-group1
listeners:
internal:
authentication:
type: ldap
jaasConfig:
secretRef: credential
tls:
enabled: true
external:
externalAccess:
type: nodePort
nodePort:
host: kafka.example.com
nodePortOffset: 30000
authentication:
type: ldap
jaasConfig:
secretRef: credential
tls:
enabled: true
authorization:
type: rbac
superUsers:
- User:kafka
services:
kafkaRest:
externalAccess:
type: nodePort
nodePort:
host: kafka.example.com
nodePortOffset: 30100
mds:
tls:
enabled: true
tokenKeyPair:
secretRef: mds-token
externalAccess:
type: nodePort
nodePort:
externalTrafficPolicy: Cluster
host: kafka.example.com
nodePortOffset: 30200
provider:
type: ldap
ldap:
address: ldap://ldap.confluent.svc.cluster.local:389
authentication:
type: simple
simple:
secretRef: credential
configurations:
groupNameAttribute: cn
groupObjectClass: group
groupMemberAttribute: member
groupMemberAttributePattern: CN=(.*),DC=ldap,DC=example,DC=com
groupSearchBase: dc=ldap,dc=example,dc=com
userNameAttribute: cn
userMemberOfAttributePattern: CN=(.*),DC=ldap,DC=example,DC=com
userObjectClass: organizationalRole
userSearchBase: dc=ldap,dc=example,dc=com
dependencies:
kafkaRest:
authentication:
type: bearer
bearer:
secretRef: mds-client
zookeeper:
endpoint: zookeeper.confluent.svc.cluster.local:2182
authentication:
type: digest
jaasConfig:
secretRef: credential
tls:
enabled: true
```
As per the above configuration only objects/users defined with "organizationalRole" object class and at "dc=ldap,dc=example,dc=com" this directory can only be able to authenticate on control center. I have custom users at "ou=users,dc=ldap,dc=example,dc=com" this directory with object class "inetOrgPerson". I want to change the configuration, so that these custom users can also be able to authenticate on control center.

I have tried to change the configuration of LDAP in kafka deployment file, userSearchBase:ou=users,dc=ldap,dc=example,dc=com & userObjectClass: inetOrgPerson. but with configuration Kafka pod didn't come up and showing authentication failed error.

As per me Kafka & MDS both are taking same LDAP configuration to authenticate. I tried to keep them separate by providing below given configuration to Kafka deployment.
```
identityProvider:
type: ldap
ldap:
address: ldap://ldap.confluent.svc.cluster.local:389
authentication:
type: simple
simple:
secretRef: credential
tls:
enabled: true
configurations:
groupNameAttribute: cn
groupObjectClass: group
groupMemberAttribute: member
groupMemberAttributePattern: CN=(.*),DC=ldap,DC=hcloneclick,DC=com
groupSearchBase: dc=ldap,dc=hcloneclick,dc=com
userNameAttribute: cn
userMemberOfAttributePattern: CN=(.*),DC=ldap,DC=hcloneclick,DC=com
userObjectClass: organizationalRole
userSearchBase: dc=ldap,dc=hcloneclick,dc=com
```
but this configuration is ignored because RBAC is enabled. For Kafka authentication, MDS LDAP configuration is automatically used because of RBAC.

Start with the Kafka custom resource YAML, comparing services.mds.provider.ldap.configurations with the attempted identityProvider configuration and the listener authentication settings. Verify how userSearchBase and userObjectClass are applied when RBAC is enabled; done means custom inetOrgPerson users under ou=users can authenticate while the predefined users continue to work.

Written by the indexing model from the issue text.