Remove epic_links feature flag and add documentation
What does this MR do?
- it removes
epic_links
feature flag (for both backend and frontend) - TODO: it adds documentation for epic links
What are the relevant issue numbers?
Closes #8894 (closed), #8915 (closed)
Does this MR meet the acceptance criteria?
-
Changelog entry added, if necessary -
Documentation created/updated
Edited by Jarka Košanová