Remove app() helper

[krzysztofrewak]

As @Baakoma suggested, we should try to remove app() helper from the Features. Probably we could inject it with some constructors... but I don't know how to do that with traits. Additionally, I don't want to add entire Laravel as dependency too, so it can be hard.

It's used here:

• https://github.com/blumilksoftware/behat-laravel-toolbox/blob/main/src/Features/Traits/Http.php
• https://github.com/blumilksoftware/behat-laravel-toolbox/blob/main/src/Features/Traits/Middleware.php
• https://github.com/blumilksoftware/behat-laravel-toolbox/blob/main/src/Features/Traits/Database.php

[krzysztofrewak]

I'm afraid that we cannot inject anything into context's constructor as it's not built with service container.

In Validator.php line 61:

  Can not find a matching value for an argument `$app` of the method `App\Testing\Context\Eloquent\Users::__construct()`.  

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Behat docs provides a way to setting up constructor values, but it looks like it's working with primitive types only.