switch from SwiftMailer to Symfony mailer
Description
SwiftMailer is not maintained anymore. This poses potential security risks.
Goal
Switch to Symfony mailer. This requires multiple code changes.
Evidence
https://foodsharing.freshdesk.com/a/tickets/2842
Solution
(Here the devs may note which steps to undertake)
-
(placeholder) -
mark the task as done in #1056 (since we currently don't have epics available)