Replace kernel reboot with actual boot to reset services

[Seros]

Hi,
we are using codeception in our api-platform project and atm we are blocked because of symfony/symfony#59036. It got resolved for users of phpunit with WebTestCase tests but in codeception we are still struggling with this. I debugged this and compared both the same workflow of tests in codeception and phpunit. There I noticed that in \Symfony\Bundle\FrameworkBundle\KernelBrowser::doRequest the kernel is booted and shut down before the request and in codeception the kernel is just rebooted without calling the function to reset all resettable services. This change should fix this and ensure, that the requests formats are in a valid state before each request. I'll try to provide a test for this later on. For now I just ensured that current tests are not breaking

[TavoNiievez]

@Seros Since this change affects the Connector we do need a test for this.

Both to know that we are not breaking anything and that it will not break again.
For the moment I made a commit to avoid that boot → shutdown → boot directly, trying to follow how it is done in Symfony.

Please follow the contribution guide and we will move forward with this.

[Seros]

I see. Thanks for making this clear and improving the logic. For my particular problem I would need to install and configure api-platform/symfony v4 in the test project to reproduce the faulty behaviour. Would this be ok?

[TavoNiievez]

@Seros Yes.

I would like to have it as an independent branch with a separate job, but for the moment you can send a normal PR, I will take care of setting it up.

[Seros]

Added the test, happy to receive feedback