Improve build workflow with Behat tests
Improve build workflow with Behat tests

In this change I have moved one series of unit tests and behat tests
forward for quick feedback. If these fail, the rest won't execute. In
the build matrix I have excluded these runs since they do not need to be
performed twice.

I have also included PHP 7.4 for running the behat tests; in future
updates we need to add tests on built PHAR files.

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