WIP: Upgrade PHPUnit

[kassner]

Work in progress

Description

Given Magento 2.3 supports only PHP 7.1+, we can upgrade PHPUnit to a supported version. This PR is an attempt to gather what is needed for this upgrade to be successful.

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 are green)

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[orlangur]

@kassner I believe this will be done by core team at appropriate moment and cannot be done via GitHub due to lack of b2b/ee code access.

@buskamuza what do you think?

[buskamuza]

Actually, based on PHPUnit changelog, I don't think this upgrade impacts tests themselves. So the important part is fixing the framework (listeners) as it's done in this PR.
But core team (or somebody with access to ee/b2b code) is still needed to verify that no tests are broken indeed.

[sivaschenko]

Thanks for the nice initiative @kassner !

I think there might be a problem with https://github.com/magento/mtf as phpunit-selenium 4.1 (current dependency) does not support PHPUnit 7. So we might need to update MTF first.

@okolesnyk what do you think?

[orlangur]

Closing due to inactivity. Feel free to reach me out anytime later if you wish to continue work on this pull request and it will be reopened.
Thanks for collaboration!

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