Mention the parent ou when searching for an LDAP cn

ZD (internal link): https://gitlab.zendesk.com/agent/tickets/102119

When searching for a LDAP group to add a group link, we currently get results with just the cn specified. This can get confusing if there are multiple cns in the LDAP server with the same name. It would be helpful to specify the parent ou so it's clear which cn is found.

For example, say we have the following structure:

| |--ou=cicd 
| |---cn=high 
| |---cn=medium 
| |---cn=low 
| |--ou=orchestration 
| |---cn=high 
| |---cn=medium 
| |---cn=low
| |--ou=onboarding 
| |---cn=high 
| |---cn=medium 
| |---cn=low

Then searching for high would yield the following:

Instead, the customer is suggesting that we return either one of the following 2 scenarios: