[epic] openQA test harness to execute playwright tests
In #116923 people are discussing how to do automated Agama ALP installer tests. One candidate is https://playwright.dev/ . For this people don't necessarily want to write openQA test modules just to get playwright tests running. Maybe we can offer a simple openQA test harness, e.g. container backend, that takes a simple shell script (or python or whatever), spawns an openQA multi-machine tests with the ALP installation image in one machine and in parallel the configurable container image running the tests, accessing the Agama installer in the first machine.