Migrate test suite to single-node Kubernetes infrastructure

[mirekys]

This PR is an attempt to migrate ocm test scenarios to be able to run on a k{38}s cluster in order to make it much easier to deploy, debug and manage test scenarios, and to test the whole infrastructure.

• Suggested workflow would be like:

$ ./bootstrap.sh                    # Sets up Docker images, Helm repositories, Kubernetes cluster resources, etc...
$ ./deploy.sh [path-to-scenario]    # Deploys a selected scenario to the k{38}s cluster
$ ./ingress-proxy.sh                # Starts a port-forwarding proxy to the k{38}s cluster ingress controller
$ ./cleanup.sh [path-to-scenario]   # Completely uninstalls a selected test scenario

• Available test scenarios can be found under ./k8s/tests

• Each test scenario must provide at least its own deploy.sh and cleanup.sh script, which
  manages k{38}s resources related to it.