Fix '/unassign' slash command
What does this MR do?
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/unassign
now unassigns all the assignees or specified - Fixes
/assignee
command so it append assignees to Issues and replaces for MR - Implements
/reassign
command
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master
(if it does - rebase it please) -
Squashed related commits together
What are the relevant issue numbers?
closes https://gitlab.com/gitlab-org/gitlab-ee/issues/2470 and https://gitlab.com/gitlab-org/gitlab-ee/issues/2516
Edited by Valery Sizov