Port of ccr/51520_change_milestone_email to EE
What does this MR do?
Port of !22279 - Add email for milestone change
Sends an email when a milestone is changed or removed on a merge request and on an issue.
What are the relevant issue numbers?
Closes #51520 - Send email notification for changing milestone on issues and merge requests
Does this MR meet the acceptance criteria?
-
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides