[9.x] Add the beforeRefreshingDatabase function to the Testing/RefreshDatabase trait

[roksprogar]

Type: Improvement

This pull request adds beforeRefreshingDatabase to Testing/RefreshDatabase trait.

Use Case

When using the refreshDatabase trait in my feature tests, I needed to run the php artisan db:wipe --database another-database-connection before the migrations were run, or the migrations kept failing with "table already exists" - because the other database wasn't wiped beforehand. With the added beforeRefreshingDatabase function, I was able to wipe out the other database in any of my tests like this:

class DataExportTest extends TestCase
{
    use RefreshDatabase;

    protected $seed = true;

    protected function beforeRefreshingDatabase()
    {
        $this->artisan('db:wipe --database another-database-connection');
    }

    public function test_prepare_some_data()
    {
        ...
    }
}

I think this function could be useful to other developers as well, because it allows for running just about anything before the database is refreshed.