[php-src] Issue #12576: No exception on `mysqli::rollback` when transaction is no longer active

Issue: https://github.com/php/php-src/issues/12576 Author: mvorisek ### Description Repro steps: 1. have an open mysqli connection 2. start transaction using mysqli::begin_transaction 3. run some query like analyze table xx, this is "administrative statement" [1] which implicit autocommit 4. rollback transaction using mysqli::rollback and notice no exception is thrown Since PHP 8.0, PDO checks if a transaction is active and throws an exception: PDOException: There is no active transaction mysqli must throw the same exception as well. [1] docs https://dev.mysql.com/doc/refman/8.0/en/implicit-commit.html and repro: https://dbfiddle.uk/GalZau4E ### PHP Version 7.4 - master ### Operating System any