33309: Eliminated AspectMock usage from TestGeneratorTest.php

[anzin]

Description

I've eliminated AspectMock usage from dev/tests/unit/Magento/FunctionalTestFramework/Util/TestGeneratorTest.php.

Fixed Issues (if relevant)

1. Fixes magento/magento2#33309: [MFTF] Eliminate AspectMock from TestGeneratorTest (Complex!)

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/verification tests (if applicable)
• [ ] All automated tests passed successfully (all builds on Travis CI are green)
• [ ] Changes to Framework doesn't have backward incompatible changes for tests or have related Pull Request with fixes to tests

[jilu1]

@magento import pull request to https://github.com/magento-commerce/magento2-functional-testing-framework

[magento-engcom-team]

@jilu1 the pull request successfully imported.

[jilu1]

@anzin Thank You for your PR! Please address unit test failures in TestGeneratorTest.

[jilu1]

@magento import pull request to https://github.com/magento-commerce/magento2-functional-testing-framework

[magento-engcom-team]

@jilu1 the pull request successfully imported.