\Drupal calls should be avoided in classes

Problem/Motivation

CacheTagsSimplifySubscriber calls the \Drupal::config() method, this is not recommended in object oriented code.

Steps to reproduce

https://git.drupalcode.org/project/cache_tags_simplify/-/jobs/4763018

Proposed resolution

CacheTagsSimplifySubscriber should use dependency injection to inject the config factory service.

Remaining tasks

User interface changes

API changes

Data model changes