Cover \Magento\CheckoutAgreements\Model\ResourceModel\Agreement\Grid\Collection class with Integration test

[TomashKhamlai]

Description (*)

Test will fail. Try to "combine" with #18412

Fixed Issues (if relevant)

1. With this test the issue checkout_agreement_store doesn't exist #18357 is discoverable and the Fixes #18357 - SQL error when table prefix used. #18412 is covered.

Manual testing scenarios (*)

1. Not applicable

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 @TomashKhamlai. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento-engcom-team give me test instance - deploy test instance based on PR changes
• @magento-engcom-team give me $VERSION instance - deploy vanilla Magento instance

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[magento-engcom-team]

Hi @TomashKhamlai. Thank you for your contribution.
We will aim to release these changes as part of 2.3.1.
Please check the release notes for final confirmation.

[magento-engcom-team]

Hi @TomashKhamlai. Thank you for your contribution.
We will aim to release these changes as part of 2.3.1.
Please check the release notes for final confirmation.