Fix usability with mirroring sample images in disconnected environments

User Story

As an cluster administrator of a disconnected OCP cluster,
I want a list of possible sample images to mirror
So that I can configure my image mirror prior to installing OCP in a disconnected environment.

Acceptance Criteria

• Publish the list of the sample images to mirror as a ConfigMap in the samples operator namespace.
• Provide instructions on how to obtain the current image SHAs from the list above (via podman or skopeo).
• Reference the ConfigMap name in our "import failing" alert.
• [optional] Reference the ConfigMap name in our "Removed" condition message.

Notes

it is too onerous to find a connected cluster in order to obtain the list of possible samples images to mirror using the current documented procedures.
I need a list make available to me in my disconnected cluster that I can reference after initial install.