Call all involved class on TypeSpecifierAwareExtension

[ChinaskiJr]

Bug report

When working with @brambaud on this feature request for phpstan-phpunit, we discovered a bug that been confirmed by @ondrejmirtes.

We need to call all involved class when creating a TypeSpecifierAwareExtension, the involved code is here : https://github.com/phpstan/phpstan-src/blob/2.1.x/src/Analyser/TypeSpecifier.php#L523

The specifyType method is only called if there is one and only one referenced class. In our case, we can have an intersection of a MockObject and the class being mocked.

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