Add latest changes from gitlab-org/gitlab@12-10-stable-ee

CHANGELOG-EE.md

 Please view this file on the master branch, on stable branches it's out of date.
 
+## 12.10.7 (2020-05-27)
+
+### Security (3 changes)
+
+- Change the mirror user along with pull mirror settings.
+- Allow only users with a verified email to be member of a group when the group has restricted membership based on email domain.
+- Do not auto-confirm email in Trial registration.
+
+
 ## 12.10.6 (2020-05-15)
 
 - No changes.