Purge user settings are not migrated from Drupal 7 to Drupal 9

Problem/Motivation

When migrating a Drupal 7 site, using purge_user, over to Drupal 9, the purge_user settings won't migrate.

Steps to reproduce

Proposed resolution

Provide a way to migrate purge_user settings from Drupal 7 to Drupal 9.

Remaining tasks

User interface changes

API changes

Data model changes