oc mirror does not mirror intermediate versions on eus channels with shortestPath

Issue

• When using shortestPath: true in oc mirrorin an EUS channel, only the minVersion and maxVersion are mirrored, but not an intermediate version that allows upgrading between them.

• For example, when using an ImageSetConfiguration such as this

  kind: ImageSetConfiguration
  apiVersion: mirror.openshift.io/v1alpha2
  storageConfig:
  local:
    path: ./oc-mirror-metadata
  mirror:
  platform:
    graph: true # Required for the OSUS ooperator
    architectures:
      - amd64
    channels:
    - name: stable-4.12
      minVersion: '4.12.28'
      maxVersion: '4.12.28'
      shortestPath: true
      type: ocp
    - name: eus-4.14
      minVersion: '4.12.28'
      maxVersion: '4.14.16'
      shortestPath: true
      type: ocp
  

  No 4.13.z version is mirrored, so no EUS upgrade is possible in a supported way.