Provide copy-able text output for failures in openqa_from_containers tests
The failure observed in https://openqa.opensuse.org/tests/2121659#step/build/8 can only be found by inspecting the correct needle and typing up the text in it or feeding it through ocr by hand (see #104619 for the failure itself).
I've had to figure out how to deal with this before, and I think I shouldn't have to when we have serial console support and even OCR in openQA itself which could also be used.
- AC1: Failures in openqa_from_containers appear as text
- Look into providing copy-able OCR output and surfacing it in the webUI
- Change the test to produce copy-able output via a serial console or equivalent