Add support for Fastly (default for Adobe Commerce on Cloud projects)

[aadmathijssen]

Issue Brief

The latest version of the Tweakwise plugin does not support personal merchandising for Adobe commerce on Cloud projects, as these projects use Fastly instead of Varnish.

Environment

• PHP Version: irrelevant
• Magento Version: Adobe Commerce hosted on Cloud
• Tweakwise Version: 7.x
• Tweakwise Export Version: irrelevant
• Magento Deploy Mode: irrelevant
• Third party modules: irrelevant

Details

The \Tweakwise\Magento2Tweakwise\Helper\Cache::isVarnishEnabled method checks whether the value of the system/full_page_cache/caching_application configuration settings is equal to \Magento\PageCache\Model\Config::VARNISH (2).

However, even though Fastly is based on Varnish, it uses a different value: \Fastly\Cdn\Model\Config::FASTLY (42).

[ah-net]

@aadmathijssen

Fastly should still work (even though we didn't test it with fastly) because we use the same caching mechanism that magento uses for the header. So we would expect it to still work with fastly.

We will look into this and see if we can add fastly to the check