bug: REMOVE 'file/in/volume' panics

[candiduslynx]

It's caused by the following section:

databricks-sql-go/connection.go

Lines 579 to 586 in d70ab7c

	var stringValues []string = make([]string, 4)
	for i := range stringValues {
	if s, ok := sqlRow[i].(string); ok {
	stringValues[i] = s
	} else {
	return dbsqlerrint.NewDriverError(ctx, "received unexpected response from the server.", nil)
	}
	}

It's assumed when handling staging requests to always have 4 columns in the return, however, remove returns only 3 (there's no local file).