array_column over objects should not extract private properties

[janedbal]

Bug report

• Compare with real behaviour: https://3v4l.org/bJYSl
• Docs: https://www.php.net/manual/en/function.array-column.php

Code snippet that reproduces the problem

https://phpstan.org/r/42094b7e-629a-4653-acb1-f253e42e75d5

Expected output

For private props, generic array should be inferred. If no __isset is present, empty array could be inferred.

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[phpstan-bot]

Closed via merging phpstan/phpstan-src#5210