[php-src] PR #23835: ext/pdo: Throw a ValueError from bindColumn() for an unknown column

Pull Request: https://github.com/php/php-src/pull/23835 Author: iliaal Follow-up to #23799, where kamil-tekiela asked for a ValueError here. A column name that is not in the result set is a programming error, so bindColumn() now throws instead of reporting through PDO::ATTR_ERRMODE and returning false, matching how the same argument already rejects an empty name or an index below one. bindParam() and bindValue() keep their ERRMODE error. The equivalent site in rewrite_name_to_position() is reachable only after execute() has populated bound_param_map, so the bind methods never get there; instrumenting it across ext/pdo, ext/pdo_mysql and ext/pdo_sqlite showed every hit coming from execute(). Converting it would change execute(), which is a separate decision.