Merge branch 'nd/create-epic-work-item-trait' into 'master'

Add epic work item trait

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/143242



Merged-by: Alexandru Croitor <acroitor@gitlab.com>
Approved-by: Eugenia Grieff <egrieff@gitlab.com>
Approved-by: Alexandru Croitor <acroitor@gitlab.com>
Reviewed-by: Alexandru Croitor <acroitor@gitlab.com>
Reviewed-by: Eugenia Grieff <egrieff@gitlab.com>
Co-authored-by: Nicolas Dular <ndular@gitlab.com>