User Story:
As an OpenShift Engineer, I want to migrate CI installs to use ImageDigestSources, so that installations do not start failing when imageContentSources are removed.

Description:
In our current OpenShift deployment, we use imageContentSources to define the image cache during the installation process. However, imageContentSources is deprecated it will be required to switch to ImageDigestSources to ensure caching continues to work. It must be confirmed that older versions of OpenShift continue to work. 

Acceptance Criteria:
1. CI steps use ImageDigestSources instead of imageContentSources for image caching.
2. Ensure that installations continue to function without errors when imageContentSources are migrated to ImageDigestSources.
3. Ensure that all supported versions of OpenShift continue to work. 

Other Information: 

• Introduced in https://github.com/openshift/release/pull/57242

issue created by splat-bot