Commerce.Find: Searchable(false) attribute is missing on some content types in commerce

Description

Add attribute searchable(false) on properties in EPiServer Commerce base classes (CatalogContentBase, EntryContentBase, ProductContent, VariationContent, NodeContentBase, NodeContent, CatalogContent) that should not be indexed in the "SearchText" field in FInd.

Scenario 1

When searching for products in the 'Keyword Search Find' on the site, I just want to get hit's that is relevant.

Scenario 2

When looking at the indexed content, the "SearchText" field should not contain Guids, or image links by default.