Merge branch 'security-2779-fix-email-comment-permissions-check-11-5' into 'security-11-5'
[11.5] Fix discussion replies permissions check See merge request gitlab/gitlabhq!2826 (cherry picked from commit 4f03d5181046ccaf8c09906159c5266eb3564aef) 33bbf8f0 Prevent comments by email when issue is locked