Switch from `harbor-repo.vmware.com` to `packages.broadcom.com`

[mp911de]

Requirements:

• Where to read images from (packages.broadcom.com/artifactory)?
  • Authentication?
• Where to publish images to for Dev Tools, custom CI images?
  • Authentication?

Changes:

• Introduce credentials for image build (docker.withRegistry(p['docker.registry'],p['docker.credentials']) { docker.build(…).push() })
• Ensure credential usage for Testcontainers

Docker Pipeline plugin docs: https://docs.cloudbees.com/docs/cloudbees-ci/latest/pipelines/docker-workflow