Allow child jobs to run as soon as phpcs and spellcheck are completed

Made a branch where phpstan fails - you can see that the Test jobs all start, but then get cancelled because the phpstan job fails. In this case it was within a few seconds of each other (hard to tell unless watching it live) which means the Test jobs didn't start a pod yet. https://git.drupalcode.org/project/drupal/-/pipelines/257801

This means we get the benefit of the lint jobs preventing a full test run if they fail without having to wait for every single test to finish.

As mentioned probably hard to see without it being live. But idea of starting as soon as phpcs is done makes sense. And probably be very welcome as I've seen code that probably works but never ran because a spacing issue or something small.

Let's see how it goes

Committed and pushed c1463afbf7 to 11.x and 7ca814c420 to 11.0.x and b74565b08b to 10.4.x and 4a46235f62 to 10.3.x. Thanks!

nod_ → closed merge request !9249

This broke the performance test pipeline. I think we could probably fix it by moving the performance pipeline into the main .gitlabci.yml, but reverting for now.