⚠️ Move to separate ECR Public repositories for each service controller

[jaypipes]

• Script to ensure each service controller has its own ECR Public repository under the new AWS account
• Populate all images for all releases of all controllers into new repositories
• Update ProwJob and script for publishing to new locations
• Update docs about installation and releases to point to new repositories
  • dev-docs/release.md
  • user-docs/install.md
• Submit alias transfer request through ECR Public to have aws-controllers-k8s registry alias moved to new AWS account registry