fix(mysql): Work around for Issue #2206 (ColumnNotFound error when querying) (#4086)

* Re-read mysql column info during execute

MariaDB may change the column info between PREPARE and EXECUTE if the schema changes
(https://jira.mariadb.org/browse/MDEV-27013). Therefore, always read column info from
the execute metadata and use it for the row column_names field. Fixes: #2206, #1530

* doc: caution that ColumnIndex may differ between Statement and Row