[php-src] PR #23864: zend: Remove `zend_execute_scripts()`

Pull Request: https://github.com/php/php-src/pull/23864 Author: TimWolla This function is unsafe, because it reused the retval for each execution, without clearing it in-between each script, leading to memory leaks. Instead of fixing it, we just remove it: Writing a loop yourself is not much more complicated than using this variadic function and provides more flexibility.