Fix unassign slash command preview
What does this MR do?
Fixes preview for unassign slash command.
Note: Tests are in EE version of the patch (https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/5334)
Why was this MR needed?
unassign slash command's preview returns all assignees even if specific user references are provided as params.
Does this MR meet the acceptance criteria?
-
Changelog entry added, if necessary -
Tests added for this feature/bug
What are the relevant issues numbers?
Edited by Athar Hameed