[GH-8644] PHP: Fixed autocompletion for new without parentheses if class has a fully qualified name

[troizet]

Fix for #8644
Example:

<?php

new Random\Randomizer()->getB

before:

after:

---

^Add meaningful description above

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[tmysik]

Looks good to me, thank you!

[NReib]

looks good to me as well, thank you