Feature/remove vcl hit

[toonvd]

Description

This PR is a rework of the Magento VCL (the vcl_hit part) PR found here: https://github.com/magento/magento2/pull/36796/files

All credits go to @peterjaap and @ThijsFeryn, I am simpling slicing this up and removing controversial parts to get early approval.

Related Pull Requests

https://github.com/mage-os/mageos-magento2/pull/62 https://github.com/mage-os/mageos-magento2/pull/69 https://github.com/mage-os/mageos-magento2/pull/70 https://github.com/mage-os/mageos-magento2/pull/71

Manual testing scenarios

• Load the new VCL
• Test generic Magento functionality

Contribution checklist (*)

• [x] Pull request has a meaningful description of its purpose
• [x] All commits are accompanied by meaningful commit messages
• [x] All new or changed code is covered with unit/integration tests (if applicable)
• [x] README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• [x] All automated tests passed successfully (all builds are green)