Check work_item_epics flag in group autocomplete issues
What does this MR do and why?
The flag work_item_epics
should be used to control the inclusion of work item of Epic
type in the endpoint groups/autocomplete_sources#issue
. This flag was not available yet when the change was introduced so we used namespace_level_work_items
in the meantime.
Also, this MR removes the dependency on the flag cache_autocomplete_sources_issues
because the caching will be tested separately.
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Related to #467391