add referenceId to graph change return in backend

[claireolmstead]

Purpose

The goal of this PR is to display the proper loading indicator for follow and unfollow using the webhook endpoint.

Closes #101

Solution

Use the graphOperationStatus to get the status of the graph change operation and display the correct state in the frontend. @JoeCap08055

Change summary

• Return reference id on follow/unfollow in the backend
• Use reference id to get the graphOperationStatus
• Poll to update frontend when the status has changed

Steps to Verify

1. Follow
2. See updating
3. Wait and and see it automatically change to unfollow
4. Click unfollow
5. See updating
6. Wait and and see it automatically change to follow