This adds initial support for k8s via the `USE_KUBE_CONTROL_PLANE` environment
variable:

- models/pipelines/experiments in components/model.js are modified to also
return CR yamls
- updates functions in components/utils.js (including `setupBase(...)` and
`teardownBase(...)` to use xk6-kubernetes, when configured
- all scenarios already using `setupBase(...)` should work unchanged

**Which issue(s) this PR fixes:**
- INFRA-949 (internal issue) Extend existing k6 scenarios to use xk6-kubernetes

- [ ] Test functionality in kind
- [ ] Extend existing k6 scenarios to use xk6-kubernetes

- works: model creation + load
- fails: getting model status via k8s (permissions)
- fails: deleting/tear down models (permissions)

- cleanup commented debug calls
- remove minReplicas from CRs