Make Valery an EE maintainer
Based on internal discussion https://dev.gitlab.org/gitlab/organization/issues/527
Because:
- Valery already does CE to EE merges and a lot of EE features
- Having separate EE developer will increase EE quality
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Based on internal discussion https://dev.gitlab.org/gitlab/organization/issues/527
Because: