[ZD#766020] show last name in search results

:bug: 

We aren't showing the person's last name in the search results listing.

#### References:

- [[ZD#766020] Highrise integration search feature is not showing first and last name for search results + can't search by email](https://support.zendesk.com/agent/#/tickets/766020)

/cc @maximeprades @jdmanuel