Support passthrough email mapping for multi user picker fields

Description

It's not possible to map "User Picker (multiple users)" by passthrough by email.
This should be made possible.

Environment

None

Assignee

Unassigned

Reporter

Sync User [K15t]

Labels

None

Participants

None

QA Status

None

Deployment

Cloud
Server

Documentation Status

None

UI Concept

None

External Votes

None

Components

Priority

Major
Configure