feat(cluster-shield): add logic to load OpenShift ca cert to cluster shield

[maratsal]

add logic to load OpenShift ca cert to be able to use it when communicate to internal registry without using registry_ssl.verify=false to avoid error like below:

failed to load image with remote analyzer: Get "https://image-registry.openshift-image-registry.svc:5000/v2/": tls: failed to verify certificate: x509: certificate signed by unknown authority

What this PR does / why we need it:

Checklist

• Title of the PR starts with type and scope, (e.g. feat(agent,node-analyzer,sysdig-deploy):)
• Chart Version bumped for the respective charts
• Variables are documented in the README.md (or README.tpl in some charts)
• Check GithubAction checks (like lint) to avoid merge-check stoppers
• All test files are added in the tests folder of their respective chart and have a "_test" suffix