Rework the messenger integration

[Toflar]

Fixes #7251

• All the Messenger magic is gone, we now always use the Doctrine queue and all messages are always sent to the queue.
• Everything that used the SyncTransport before is now automatically delayed to the kernel.terminate event providing an advantage for all users (that have access to fastcgi_finish_request()), not only the ones that have the cronjob configured.
• Logic spread across 4 classes is now centralized in 1 🥳
• It fixes the You cannot call ack() on the Messenger SyncTransport. no matter the grace period because the transport configuration does not change anymore.
• The grace period has been adjusted to 10 minutes and is now also configurable

I've split deleting the old logic and the new in two commits so that it's easier to review.

Remarks:

• I decided to not create separate *Listener classes because they would all be one-liners forwarding to the WebWorker service. Now, all the magic is part of the WebWorker which makes it way easier to understand and see what's going on. I know we have *Listener classes for almost everything else but I strongly suggest to not do that in this case. It also makes removing the one single service from the container super easy in case no transport is configured to use the web worker (core-bundle standalone default).

[Toflar]

@ausi this is almost ready for review. There's a problem with your GlobalStateWatcher though, it detects that [Symfony\Component\Clock\Clock::globalClock] is set during the tests which is correct but there's no way to fix this. It's instantiated in the Worker and there's no way to pass a mock object there. Also, there's no way to reset the Clock to null once it's set. I think this very special case should be ignored as the Clock class is designed to work like this. Wdyt?

[ausi]

I think this very special case should be ignored as the Clock class is designed to work like this. Wdyt?

Yes, it should be added to the ignore list here:

contao/core-bundle/tests/PhpunitExtension/GlobalStateWatcher.php

Line 161 in 3ec0141

'Symfony\Component\Config\Resource\ComposerResource',

[ausi]

Is there an easy way to remove the info output in the tests?

[ausi]

LGTM 🎉
(Did not test it manually)

[leofeyer]

Thank you @Toflar.