Use a test module instead of Ban in tests

Problem/Motivation

Part of removing Ban from core.

Ban is used in some tests.

Steps to reproduce

Proposed resolution

Replace Ban with a test module, as needed.

Ban is used in migration tests but I suggest that those are not changed because Migrate Drupal and Migrate Drupal UI are to be deprecated and removed.

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet