implement onlyMethods for phpunit10 Polyfill

[HillLiu]

Yoast/PHPUnit-Polyfills#58

PHPUnit\Framework\MockObject\MockBuilder

https://github.com/sebastianbergmann/phpunit/blob/10.0/src/Framework/MockObject/MockBuilder.php

PHPUnit_Framework_MockObject_MockBuilder

https://github.com/sebastianbergmann/phpunit-mock-objects/blob/4.0.0/src/MockBuilder.php#L92