[18.0][MIG] product_matrix_show_color

[ferran-S73]

Migration from #289

[Reyes4711-S73]

LGTM

[eugenios73]

LGFM

[ferran-S73]

@OCA/product-maintainers I'll need some help with this PR's tests if anyone could help me I'd be very thankful.

Context:
Both base modules "product" and "product_matrix" create a product.attribute with the name "Size".
The problem is the module "product_variant_default_code" from this repo implements a constraint on unique attributes name. Then since this module depends on both product and product_matrix and error is thrown when trying to create the constrain as there's already a repeat in attribute's names.

Is there anything we can do in this situation?

[github-actions]

There hasn't been any activity on this pull request in the past 4 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 30 days.
If you want this PR to never become stale, please ask a PSC member to apply the "no stale" label.