* FIX PHP 8.1 support in MySQLiConnector::query errors
The default error reporting mode in PHP 8.1 has changed from using
errors reported on the connection handle to throwing
mysqli_sql_exception. query() makes no allowance for this, and
functions up the call stack expect to catch
Silverstripe\ORM\Connect\DatabaseException instead - resulting in the
MySQLi exception going all the way up to halt the system.
We can use a try, catch, and finally to retain backwards compatibility,
no matter which setting (e.g. PHP version default) someone has enabled.
* Move MySQLConnector test skip call into setUp()
As review feedback; marking the test as skipped in a private function
obfuscated where the call was happening and made it harder to skimread
the tests. Moving this into a setUp function makes it obvious the check
is run before each test case, and skipped if necessary.
