Handle export/import of legacy epic
In order to continue to keep Epics in sync with their corresponding work item we need to investigate how to handle the export and import of legacy epics. To accomplish that we currently need to take care of 2 tasks: - ~~[ ] https://gitlab.com/gitlab-org/gitlab/-/issues/446154+~~ - ~~[ ] We need to do this anyway in order to support export/import of epics and group level work items~~ - [x] https://gitlab.com/gitlab-org/gitlab/-/issues/446155+ Related discussion: - https://gitlab.com/gitlab-org/gitlab/-/merge_requests/145549#note_1791319101 - [Epic sync meeting with Import/Export Engineering](https://youtu.be/xQY8faZ4UfM)
epic