Remove MailGun onboarding messages
What does this MR do and why?
Remove in product email messages that have converted to Iterable
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #418137 (closed)
Edited by Serhii Yarynovskyi