Removes Database Reviewer template
What does this MR do?
Removes Database Reviewer template from issue templates. As per discussed on gitlab-com/www-gitlab-com!25069 (comment 186117998).
It was moved to www-gitlab-com (gitlab-com/www-gitlab-com!25158 (merged)) so it can be aligned with the Backend/Frontend trainee processes.
Edited by Mayra Cabrera