Renamed ingress-tls secret(which contains certificate issued for osdu.<domain>) and credentialName value to osdu-ingress-tls and osduCredentialName to match other credentials.
Updated parts in all READMEs mentioning credentialName
Refactored cert-manager templates to Helm chart and updated to 4 certificates.
Added generate_self_signed_certs variable to add possibility to disable default creating of self-signed certificates in onprem_cluster module.
Updated openssl, certbot and cert-manager instructions in onprem_cluster README to create 4 certificates.
Updated DF Helm scheduled pipeline to create self-signed certs with correct domain using Terraform.
