Add inbox test recipients from spreadsheet to test lists

You use spreadsheet rows for inbox test recipients; unprocessed rows delay validation and risk sending wrong variants. It enrolls recipients into test lists so campaign managers get coverage same day.

Overview

For banking email programs, missed inbox-test rows translate to unvalidated variants and compliance risk; this flow converts spreadsheet rows into test-list enrollments automatically. Campaign managers and marketing ops get complete test coverage and approvals same day, ensuring launches proceed on schedule.