pass errorCode to SQLException

[lilyrubich]

Summary

Added pass error vendor code from ServerException to SqlException for issue #2717

Checklist

• Closes (Error code is always 0 when using newer JDBC versions #2717))

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Note

Ensures JDBC surfaces server error codes to callers.

• In ExceptionUtils.toSqlState(...), the ServerException branch now constructs SQLException(message, SQL_STATE_DATA_EXCEPTION, serverException.getCode(), cause) to include the vendor error code.

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[chernser]

@lilyrubich ,

appreciate your contribution!

[mshustov]

@chernser let's add a test in a follow-up