Submodule needs to implement commerce_product_availability_webform_request_form_commerce_order_item_add_to_cart_form_alter() to also support "Add to cart" variation forms on products

LGTM just some final improvements

Ok no idea, why this was added and how this was tested originally, but the old form id doesn't make sense at all!

For one, there is no "Order item variation" and second, "form form" doesn't make sense, as "$this->operation" will never end with "form" in
https://git.drupalcode.org/project/commerce/-/blob/8.x-2.x/modules/cart/....

The internal function needs an underscore at the beginning, this is convention for module files. If phpcs isn't happy, it should be ignored.

Welp, we have to live with it now.

This is already merged as a part of 📌 Webform Request: Add theme_hook_suggestions entries Fixed .