Groups should be searchable from the attendees dropdown

Is your feature request related to a problem? Please describe.

<img width="653" height="655" alt="Image" src="https://github.com/user-attachments/assets/2fb13b82-31ec-4eb2-8067-dfd5a156b88c" />
Describe the solution you'd like
Utilize hr-portal APIs as the user is using SSO already.

Describe alternatives you've considered