Expose blocked issue link type in issue board private API
Problem to solve
This is a prerequisite to #34723 (closed) - if we want to show in issue board whether an issue is blocked or not, we have to return this information from backend when requesting board list issues (https://gitlab.com/gitlab-org/gitlab/blob/master/app/controllers/boards/issues_controller.rb#L30).
Further details
!21375 (merged) updated REST API, but UI for issue boards uses our private API (IOW requests are processed by
app/controllers/boards/issues_controller.rb
) - on backend side we will have to make sure that we return if the issue is blocked or not
Links / references
Edited by Jan Provaznik