[FEATURE] Give Admin Users Ability to Set Contact Emails

[wendylbolm]

Is your feature request related to a problem? Please describe. User has a general contact set on profile page (via account settings). That contact email address is also used for the hold text in the recurring donations email reciept, but they would like to set a different email address as the contact for that text in recurring donation emails.

Describe the solution you'd like It would be good to systematically map this email flow and email flows for other pages and triggers (ex. replies to email receipts, text in email receipts, individual profile, campaign and event pages) to determine if more user customization/segmentation of these email addresses should be allowed. The ultimate solution would be to add UIs for setting custom contact email addresses (ex. a UI for Admin users to set the email address that is used when someone replies to a donation receipt that is emailed to them).

Additional context We already allow users to set different email addresses as their contact email for events. We have also had users ask if they can set people who don't have user log-ins as recipients to certain email notifications.