Bug: BaseBuilder::insertBatch() has 3 params and not 4

**Describe the bug**
`Model::insertBatch()`
returns
`$this->builder()->insertBatch($set, $escape, $batchSize, $testing);`
but "$testing" is not part of "BaseBuilder::insertBatch()"

**CodeIgniter 4 version**
4.0.3

**Affected module(s)**
CodeIgniter\Model
