History Log: Imported publish group

[ChrisChV]

See: https://www.figma.com/design/4wsTUbieYphB2qchIPxm10?node-id=20622-309984#1688215134

Current behaviour: When importing a legacy library, the item history log shows an empty publish group.

Expected: When importing a legacy library, the item history log must show the imported publish group:

[bradenmacdonald]

Do we have a way to record "imported" in the history backend?