Cast products "getStoreId()" to int, closes #18079

[sreichel]

Description

Cast getStoreId() for products to int (like for categories).

Fixed Issues (if relevant)

1. Inconsistent return type for getStoreId() #18079: Inconsistent return type for getStoreId() (products/categories)

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-engcom-team]

Hi @sreichel. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
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[magento-engcom-team]

Hi @sidolov, thank you for the review.
ENGCOM-3047 has been created to process this Pull Request

[magento-engcom-team]

Hi @mhauri, thank you for the review.
ENGCOM-3047 has been created to process this Pull Request

[magento-engcom-team]

Hi @sreichel. Thank you for your contribution.
We will aim to release these changes as part of 2.2.8.
Please check the release notes for final confirmation.

Please, consider to port this solution to 2.3 release line.
You may use Porting tool to port commits automatically.