Added label from store view

[sergiy-v]

Description (*)

PR for issue #250 Configurable Options Label doesn't return the Store View Label
This PR added functionality to show store label in label response

Fixed Issues (if relevant)

#250: Configurable Options Label doesn't return the Store View Label

Manual testing scenarios (*)

Request: Store Label "Custom Color", Default Store Label "Color"

{
  products(filter: { sku: { eq: "Test Configurable" } }) {
    items {
      name
      ... on ConfigurableProduct {
        configurable_options {
          attribute_code
          id
          label
        }
      }
    }
  }
}

Response:

{
  "data": {
    "products": {
      "items": [
        {
          "name": "Test Configurable",
          "configurable_options": [
            {
              "attribute_code": "color",
              "id": 35,
              "label": "Custom Color"
            }
          ]
        }
      ]
    }
  }
}

Response with empty Store Label

{
  "data": {
    "products": {
      "items": [
        {
          "name": "Test Configurable",
          "configurable_options": [
            {
              "attribute_code": "color",
              "id": 35,
              "label": "Color"
            }
          ]
        }
      ]
    }
  }
}

Also tested with different store and with branch 2.3-develop.
Api-functional test included.

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.

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