fold kola testiso into kola run

[dustymabe]

We bolted on kola testiso into kola a while ago to get coverage for our bare metal install workflows, but there are a lot of nice features in kola run that haven't been extended there and wouldn't really make sense to duplicate (for example here is a case where we duplicated a feature, but wouldn't have had to).

Let's make an effort to fold our testiso tests back into kola run and they can be ran in parallel and scheduled along with all the other kola tests that run for a given build.

[c4rt0]

If no one else is looking at this, I'd like to give it a go. That's actually something I was considering during my work on some of the kola testiso tests.

[dustymabe]

Already had talked to @nikita-dubrovskii on this one so it's scheduled for him for next sprint. It would be good to have more people involved in design and code review, though, so you two can maybe have some sessions up front discuss the strategy once you're familiar with the code. Feel free to add me.