[php-src] PR #24467: Fix GH-16910: Fractional seconds truncated in prepared statements

Pull Request: https://github.com/php/php-src/pull/24467 Author: ojuschugh1 Fixes #16910 The problem was that ps_fetch_time() and ps_fetch_datetime() only print second_part when decimals is 1 to 6, the check added for bug #76386. MariaDB reports AUTO_SEC_PART_DIGITS (39) when the precision isn't known up front, for example for FROM_UNIXTIME('1992.1'), so prepared statements dropped the fraction that the text protocol returns. I made 39 print six digits when second_part is non-zero and none otherwise, the same as MariaDB Connector/C, which gives the same strings as the text protocol. I kept it to 39 rather than every value above 6 because Connector/C checks for exactly that value. ps_fetch_time() gets the same change, though on MariaDB 13.0.2 I only got 39 for FROM_UNIXTIME() (TIMESTAMP) results. The test compares the text and binary protocol results and skips unless the server reports 39 for FROM_UNIXTIME(). It fails without the fix on MariaDB 13.0.2 and skips on MySQL 8.4.13, and the other ext/mysqli, ext/pdo_mysql and ext/mysqlnd tests give the same results with and without the fix on both servers.