Fix transitive generic interface args in Reflection

[prateekbhujel]

ReflectionClass::getGenericArgumentsForParentInterface() handled direct generic interfaces, but missed bindings inherited through a non-generic intermediate class or interface.

Example:

interface Root<T> {}
interface Mid extends Root<int> {}
class C implements Mid {}

Mid reported Root<int>, but C reported an empty list for Root.

This keeps the inheritance checker behavior unchanged. Reflection now uses the existing binding walker for the matched ancestor and walks resolved parents/interfaces when answering a transitive interface query.

Tests run:

sapi/cli/php run-tests.php -q ext/reflection/tests/generics/ancestor_args_parent_interface.phpt Zend/tests/generics/reflection/namespace_relative_extends_implements_uses.phpt Zend/tests/generics/inheritance/diamond/interface_diamond_class_impl_covariant_missing.phpt Zend/tests/generics/inheritance/diamond/interface_diamond_class_impl_missing.phpt Zend/tests/generics/inheritance/diamond/invariant_class_diamond_bad_impl_rejected.phpt Zend/tests/generics/inheritance/diamond/invariant_interface_diamond_bad_impl_rejected.phpt Zend/tests/generics/inheritance/diamond/nullable_intersection_missing_branch_rejected.phpt Zend/tests/generics/inheritance/diamond/nullable_union_missing_null_rejected.phpt Zend/tests/generics/inheritance/diamond/property_hook_get_only_diamond_bad.phpt
sapi/cli/php run-tests.php -q Zend/tests/generics ext/reflection/tests/generics

Result: 407/407 passed for the full generics + Reflection generics run.