hidden product attributes not intended for storefront

[vovsky]

Description

Hidden product attributes not intended for storefront

Fixed Issues

1. Hide product attributes not intended for storefront #25 Hide product attributes not intended for storefront

Manual testing scenarios

1. Add custom EAV product attribute with the following properties set to NO : 'is_comparable', 'is_filterable', 'is_filterable_in_search', 'is_visible_on_front', 'used_in_product_listing', 'used_for_sort_by'
2. Refresh cache
3. Attribute should not be visible in graphql

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 on Travis CI are green)

[magento-cicd2]

All committers have signed the CLA.

[keharper]

We'll need to add a place in the docs where we list the Admin settings that affect graphQL query results.