`gpns-add-other-fields-to-date-schedule.php`: Add other fields to the GP Notification Scheduler.

[saifsultanc]

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Context

⛑️ Ticket(s): https://secure.helpscout.net/conversation/2115235612/42388?folderId=7098280

Summary

Add a field other than the Date field to the Notification Scheduler. In this instance, a "Single Line Text Field" was used.