Allow running slow tests in CLI

[yoannblot]

Context

I would like to use slow-test-detector in a CI, like GitHub Actions.
In my phpunit.xml file, I have different testsuites (unit, integration...).
Each testsuite should have a different configuration.

We can not use the <extension> parameters to do it.

Expected Result

1. Could it be possible to run it in CLI with args, like?

php vendor/bin/phpunit --configuration phpunit.xml --testsuite=unit --slow-test-detector-maximum-duration=20

2. Can the result fails when at least 1 test does not respect the condition ?