Add Test Send Option for Automation Emails

🔍 Problem Statement

The Send Email (via Pelcro) automation currently only provides a basic preview and does not offer a test-send option using a real customer from the segment. This makes it difficult to verify how dynamic variables, such as {{customer.magic_link}}, will render before activating the automation for a live segment.

💡 User Story

As a user setting up an automation email, I want to send a test email using a real sample customer from the segment so that I can validate the email's final rendering and dynamic variables before activating the automation.

🎯 Definition of Done (DoD)

✔ Add a test-send option to the Send Email (via Pelcro) automation that allows users to send a test email using a selected/sample customer from the segment.