Add get-conjur-cert.sh and test-helm scripts to release artifacts

[diverdane]

Is your feature request related to a problem? Please describe.

The following scripts:

• helm/conjur-config-cluster-prep/bin/get-conjur-cert.sh
• helm/conjur-config-cluster-prep/test-helm
  should be added as artifacts for each release. Anyone using the Kubernetes cluster
  prep Helm chart may want to install the Helm charts using the CyberArk Helm repository.
  In this case, the scripts listed above will need to be downloaded separately (e.g. using wget),
  and the versions that are downloaded/run should be versioned according to release.

Describe the solution you would like

The scripts listed above are added automatically as artifacts as part of the release process.

Describe alternatives you have considered

Additional context