Add support for commerce_product and commerce_product_variation

Problem/Motivation

We are using commerce_product and commerce_product_variation for product bundling and free addon. Upon deal expiry, the offer variations are unpublished and throw errors while the main variation is being updated.

Steps to reproduce

The variation or product entity to have reference similar entity type.
Upon unpublishing the referenced entity the referring entity updating throws form error.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes