Merge branch '473764-fix-syncing-for-reordering-work-item-epic-children' into 'master'

Sync change of parent when reordering work item epic children

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/160369



Merged-by: Felipe Cardozo <fcardozo@gitlab.com>
Approved-by: Felipe Cardozo <fcardozo@gitlab.com>
Reviewed-by: Felipe Cardozo <fcardozo@gitlab.com>
Reviewed-by: Nicolas Dular <ndular@gitlab.com>
Co-authored-by: Eugenia Grieff <egrieff@gitlab.com>