Terraform Post-Merge Clean-up

[EricPonvelle]

This PR captures the missed feedback for #77311

• Updates to the cluster overview:
  • Creating ROSA with HCP clusters using the default options
  • Creating a default ROSA with HCP cluster using Terraform
  • Creating a ROSA cluster with STS using the default options
  • Creating a default ROSA (classic architecture) cluster using Terraform
• Additional resource updates:
  • ROSA with HCP
  • ROSA with classic architecture