[Task]: Remove Pimcore\Config\Config

[mcop1]

Improvement description

Pimcore\Config\Config will be removed with this pr: pimcore/pimcore#12911

Adapt the changes, e.g.

demo/src/Controller/ProductController.php

Line 185 in 5a93ca7

$filterDefinition = Config::getWebsiteConfig()->get('fallbackFilterdefinition');

should then be something like

$filterDefinition = Config::getWebsiteConfig()['fallbackFilterdefinition'];