Remove product relation foreign key

[bricht]

-Swapped catalog_product_relation foreign key for a plugin

Description (*)

Removed foreign keys from catalog_product_relation and added a plugin to remove entries from this table upon product deletion. This was done so catalog_product_relation table would work with mview, because cascade delete does not work with sql triggers.

Related to magento/catalog-storefront#437 where we use catalog_product_relation as a basis for product variant index.

Related Pull Requests

https://github.com/magento/partners-magento2ee/pull/426

Fixed Issues (if relevant)

#31061

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

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[bricht]

@magento run all tests