[EPIC] Make sonobuoy golang framework useable for production

As described in DR, scs-0200-v1-using-sonobuoy-for-kaas-conformance-tests.md, it was decided to use sonobuoy as framework to deploy tests to Kubernetes clusters.

The current Sonobuoy setup within the repository was merely a PoC. We want to make it ready for production use.

The following must therefore be adjusted/implemented:

PREREQUISITES:

• Implementation of the Golang test framework in accordance with the PoC (see: kaas-sonobuoy-go-example-e2e-framework ) #761
• CI job to create the Sonobuoy image and upload it to the Github container registry #793
  • check go sum file
  • Versioning of the test images

TASKS

• multi-arch support for arm64 and amd64 #758
• Upgrade golang version: #747
• apply golangci-lint: #771
• Write documentation on how you can contribute new tests. As part of docs/issues/201
• Zuul job to run the conformance test:
  • Plugin to create k8s clusters with cluster stack #710 #831

BACKLOG

• Write documentation on how a User(not a developer) can run the sonobuoy tests on its own.
  • currently blocked by the image not beeing build so far.
• Versioning the development environment (tools used for development)
• append kind config to choose k8s version.
• BUG: NS_PREFIX not set lets make test-function crash with a lowercase RFC 1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character
• Update the DR to describe the current setup