EE backport for !gitlab-ce/29919 (GraphQL mutations for add, remove and toggle emoji)
What does this MR do?
This is the same as the CE MR https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/29919 with the addition of a test of AwardEmojiPolicy
for Epics.
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry - [-] Documentation created/updated or follow-up review issue created
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Code review guidelines -
Merge request performance guidelines -
Style guides - [-] Database guides
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Separation of EE specific content
Performance and testing
Edited by Luke Duncalfe