Fix phpstan and commerce constructor updates #3440629

https://www.previousnext.com.au/blog/safely-extending-drupal-8-plugin-classes-without-fear-of-constructor-changes

but constructors are changing

• https://git.drupalcode.org/project/commerce/-/blob/8.x-2.x/modules/checkout/src/Plugin/Commerce/CheckoutPane/CompletionRegister.php?ref_type=heads#L128-131
• https://git.drupalcode.org/project/commerce/-/blob/8.x-2.x/modules/checkout/src/Plugin/Commerce/CheckoutPane/Login.php?ref_type=heads#L118-129

Closes #3440629