Replace prepopulate with entity prepopulate epp

Problem/Motivation

You should consider replacing the old prepopulate with epp → .
epp has much simpler syntax than prepopulate. It is much easier and faster to pass variables and fill fields. It is also easy to understand and therefore much faster in development.
https://www.drupal.org/docs/contributed-modules/entity-prepopulate →

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes