Added to group/project notification should include link to leave
When I'm added to a group I receive an email notification alerting me to the fact that someone added me to a project or group, but I might not want to be part of the group or project. It would be nice for the email to feel more like an invitation that I can decline by immediately leaving the group if I want.
Proposal
Update the current email notification to tell the user who added them, and provide a link to leave the group.
-You have been granted Master access to the test-group group.
+You have been granted Master access to the test-group group by James Ramsay.
+
+Click here to leave the test-group group.
Links
https://gitlab.com/gitlab-org/gitlab-ce/issues/44005#note_73562584