Fix double-free of doc_comment when overriding static property via trait

When redeclaring an overridden static property with a trait we're removing the
property from the class. However,

Fix double-free of doc_comment when overriding static property via trait

When redeclaring an overridden static property with a trait we're removing the
property from the class. However, because the property itself does not belong to
the class we must not free its associated data.

This issue is exposed by 9a250cc9d6 in PHP 8.3+ because duplicate static
properties in traits are no longer skipped, but redeclared.

Fixes GH-12468

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