Remove `issue_autocomplete_backend_filtering` feature flag
What does this MR do and why?
Remove issue_autocomplete_backend_filtering
feature flag to filter
issue autocomplete results on the backend to improve performance for
projects with a lot of issues.
This has been enabled on GitLab.com for almost 2 weeks. For gitlab-org/gitlab
, this improves response time from ~15 seconds to <1 second.
Related to #289238 (closed) #488831 (closed)
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Edited by Heinrich Lee Yu