refs https://github.com/TryGhost/Team/issues/1067
As part of the work of automatically logging members in after payment,
we want to revisit the emails. Currently after payment we send an email
asking a member to _confirm_ their subscription, and that they can
ignore the email to cancel the subscription. This is not the case
however, as the member has already been subscribed.
refs https://github.com/TryGhost/Ghost/issues/11414
Confirms if the fromAddress for sending member emails is valid and accessible using magic link flow, allowing owners to update full from address including domain change.
- Extends member service to handle magic link generation and validation for email update
- Updates existing setting endpoint to not directly update from address
- Adds new endpoint to send magic link to new address
- Adds new endpoint for validating the magic link when clicked and update the new email for from address
- Adds new email template for from address update email
