K8S adapter cleanup

[f1ames]

This is a follow-up of https://github.com/scramjetorg/transform-hub/pull/247. We have agreed to left some things unpolished there, especially in context of #267.

So what has left:

• [ ] Unpack only package.json (ideally to stdout) in KubernetesSequenceAdapter
• [ ] Store only compressed package on disk, such as .scramjet_sequences/<seq-id>.tar.gz
• [ ] Figure out a way to get rid of redundant scripts unpack.sh and run.sh from Runner docker image
• [ ] Support topic feature tests
• [ ] Investigate objLogger not printing in KubernetesInstanceAdapter
• [ ] Extract objLogger improvements to a separate PR
• [ ] Make yarn clean use git clean -xdf or also remove packed sequences
• [ ] Support getting runner PID in BDD tests (see here)
• [ ] Support checking if runner was closed successfully in BDD tests (see here)
• [ ] Get rid of all "no-docker" occurences
• [ ] Runner pod imagePullPolicy: "Always" only for development (see https://github.com/scramjetorg/transform-hub/pull/247#discussion_r8118832100

Probably it will be most efficient to cover it together or after #267.