Merge branch 'nd/create-epic-when-work-item-gets-created' into 'master'

Create legacy epic for new epic work items

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/150696



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