Fix uaf of MBSTRG(all_encodings_list)

We need to remove the value from the GC buffer before freeing it. Otherwise
shutdown will uaf when running the gc. Do that by switching from
zen

Fix uaf of MBSTRG(all_encodings_list)

We need to remove the value from the GC buffer before freeing it. Otherwise
shutdown will uaf when running the gc. Do that by switching from
zend_hash_destroy to zend_array_destroy, which should also be faster for freeing
members due to inlining of i_zval_ptr_dtor.

Closes GH-11822

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