Change mysql database collate to utf8mb4, fix #9030
Created by: Senorsen
This commit is to fix #9030 (closed), which allows emoji and other special unicode characters to be stored under mysql schema.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: Senorsen
This commit is to fix #9030 (closed), which allows emoji and other special unicode characters to be stored under mysql schema.