Rating form element is not properly preprocessed

Problem/Motivation

Since #3588881: Convert hooks to OOP there is a bug with the "rate_rating" form element.
Preprocess variables such as "type" and others are entirely missing.

This is caused by the change at this place:
https://git.drupalcode.org/project/rate/-/commit/d9cce1e7fa8fc89450073cf...

      'form_element__rate_rating' => [
        'base hook' => 'form_element',
        'initial preprocess' => static::class . ':preprocessFormElementRating',
      ],

Before #3588881: Convert hooks to OOP went in, there was no "initial preprocess" definition. Now since that definition was added, the original "initial preprocess" definition of the base hook "form_element" is not being called anymore. That's why the essential variables are gone now. The effect is that some classes are now incorrectly set, such as "form-type-radio" is now just "form-type-" (because the "type" variable is now missing).

Steps to reproduce

Update from 3.2.1 to 3.3.0 and see wrong classes set at the .form-item elements.

Proposed resolution

Although calling the FormPreprocess services is not officially supported (it is an @internal class), I don't see any other way than calling it manually from the newly defined "initial preprocess" function. I don't know the reason why it was added inside the scope of refactoring to OOP hooks, but maybe there was a certain reason so I'm not proprosing to remove it (unless maintainer sees no reason at all).

Remaining tasks

User interface changes

API changes

Data model changes