[9.x] Support Lazy Collections in BatchFake

[evan-burrell]

Add support for LazyCollections when using withFakeBatch

Given a basic job batch example

use Batchable;

Model::cursor()
    ->map(fn (Model $model) => new ModelJob($model))
    ->chunk(1000)
    ->each(function (LazyCollection $jobs) {
        $this->batch->add($jobs);
    });

and associated test case

[$job] = (new ModelJobBatch())->withFakeBatch();

$job->handle();

Receives
TypeError : array_merge(): Argument #2 must be of type array, Illuminate\Support\LazyCollection given