Improve user experience of oc-mirror with the OCI FBC feature

As IBM, I would like to use oc-mirror with the --use-oci-feature flag and ImageSetConfigs containing OCI-FBC operator catalogs to mirror these catalogs to a connected registry
so that , regarding OCI FBC catalog:

• all bundles specified in the ImageSetConfig and their related images are mirrored from their source registry to the destination registry
• and the catalogs are mirrored from the local disk to the destination registry
• and the ImageContentSourcePolicy and CatalogSource files are generated correctly

and that regarding releases, additional images, helm charts:

• The images that are selected for mirroring are mirrored to the destination registry using the MirrorToMirror workflow

As an oc-mirror user I want a well documented and intuitive  process
so that I can effectively and efficiently deliver image artifacts in both connected and disconnected installs with no impact on my current workflow

Glossary:

• OCI-FBC operator catalog: catalog image in oci format saved to disk, referenced with oci://path-to-image
• registry based operator catalog: catalog image hosted on a container registry.

References:

• https://docs.google.com/document/d/10hLyV0DZP-3uxJGOYzvlE-ZyJXcwD95yxxX4eKN0uOA/edit 

Acceptance criteria:

• No regression on oc-mirror use cases that are not using OCI-FBC feature
• mirrorToMirror use case with oci feature flag should be successful when all operator catalogs in ImageSetConfig are OCI-FBC:
  • oc-mirror -c config.yaml docker://remote-registry --use-oci-feature succeeds
  • All release images, helm charts, additional images are mirrored to the remote-registry in an incremental manner (only new images are mirrored based on contents of the storageConfig)
  • All catalogs OCI-FBC, selected bundles and their related images are mirrored to the remote-registry and corresponding catalogSource and ImageSourceContentPolicy generated
  • All registry based catalogs, selected bundles and their related images are mirrored to the remote-registry and corresponding catalogSource and ImageSourceContentPolicy generated
• mirrorToDisk use case with the oci feature flag is forbidden. The following command should fail:
  • oc-mirror --from=seq_xx_tar docker://remote-registry --use-oci-feature
• diskToMirror use case with oci feature flag is forbidden. The following command should fail:
  • oc-mirror --config=isc.yaml file://file-dir --use-oci-feature