resolve "unsafe usage of new static" warnings

Problem/Motivation

Now that autowiring is supported in Drupal core, there is less reason to ignore the "unsafe usage of new static()" messages that phpstan and Upgrade Status module report when scanning the module.

Steps to reproduce

Use phpstan outside the context of Drupal's phpstan.neon file (which suppresses the message), or use Upgrade Status in Drupal 11 to scan the module.

Proposed resolution

When a parent class uses AutowireTrait, use that and remove the create() method. When a parent class uses create(), use the $instance = parent::create() pattern instead of "new static".

Remaining tasks

Make an MR and test it.