Merge changes from topic "istanbul-support"

* changes:
  [ANSIBLE] Add ghcr.io to simulated hosts list
  [DOC] Update changelog
  [ANSIBLE] Setup cmctl autocompletion
  [ANSIBLE] Install cmctl utility
  [BUILD] Add download link for cmctl utility to binaries list
  [ANSIBLE] Add cert-manager provisioning playbook
  [BUILD] Fetch artifacts required by cert-manager
  [ANSIBLE] Add cert-manager role
  [MOLECULE] Add prepare-cert-manager role
  [DOC] Update changelog
  [MOLECULE] Upgrade Helm3 release to 3.6.3 in test scenarios
  [BUILD] Upgrade Helm to 3.6.3