[18.0][MIG/REF] product_analytic

[ThiagoMForgeFlow]

As mention in https://github.com/OCA/account-analytic/pull/838,

To respect the analytic distribution models defined by Odoo, a refactor is proposed for this module. In this way, analytic distribution models can be directly added, edited, or deleted from the form views of the respective Product or Product Category models.

Product variant form view:

Product category form view

With this change, the standard logic proposed by Odoo through the distribution models will be directly respected. In the previous version, the configurations set on a product or category were not merged with those defined in the distribution models.