Emails - No email to user when common is features

Tested on Staging iOS version 1.10.0(4)

Steps to reproduce:
1. As a user create a new common
2. As admin white list this common

Actual results:
No email to user when common is features

Expected results:
user who create this common should get email: (see below)

Subject: Your Common is now featured
Hello ,

The Common you created: , was selected to appear on the app’s “discover” section. Log in to find it there, and feel free to share the news with your fellow members.

For more information you can contact us any time using our support chat

Common,
Collaborative Social Action.

Start by tracing the admin whitelist flow described in the reproduction steps and identify where the featured Common transition and email handling are implemented. Confirm the result against the requested subject, recipient, body, Common link, and support-chat link; done means the creator receives that email after whitelisting.

Written by the indexing model from the issue text.