[php-src] PR #24453: Fix array_udiff_assoc() and array_uintersect_assoc() clobbering the user comparison callback

Pull Request: https://github.com/php/php-src/pull/24453 Author: lacatoire array_udiff_assoc() and array_uintersect_assoc() parse the callback straight into BG(user_compare_fci) and never restore the previous value, unlike the other array_u*() functions. A comparison callback that calls one of them is replaced by the inner callback for the rest of the sort. Split out of #24426, where the review pointed out these two functions. ### To reproduce on PHP 8.4 ```php <?php $sorted = [3, 1, 2]; usort($sorted, function ($a, $b) { echo "outer\n"; array_udiff_assoc([1], [1], function ($x, $y) { echo "inner\n"; return $x <=> $y; }); return $a <=> $b; }); ``` php repro.php Before: outer inner inner inner (the outer comparator is replaced after the first call) After: outer inner outer inner outer inner