TASK: Use dedicated testing cr instead of default for behat

[mhsdesign]

IDK, i did this change yesterday evening because i was deep in this rabbit hole and did not stop :D

The idea was that for the core behavioural test we do technically do not need to run the catchup hooks etc as this is neos part to test. And it slows down the whole test suite see issue: #4878

That would also us to get rid of the doctrine:migrate hack here: #5258 (comment)

But to be true, having the catchup always run on standby did help us in the past. Not because they did assert anything special but to assert they do not throw an exception. And all the testcases in Neos.Neos are not as complex at what the core has to offer for say special Node move strategies :)

For now as quick tip regarding performance:
I always run the tests with catchup hooks disabled: #4904

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but maybe we could indeed do this change sometime and continue to run the tests on default nightly or something :)

there is one logic error i made: The Neos.Neos tests still have to work on default because the catchup hooks need to be there.

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