USHIFT-4919: Healthcheck: Debug information about unpulled & failed images

[pmtk]

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[openshift-ci-robot]

@pmtk: This pull request references USHIFT-4919 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.20.0" version, but no target version was set.

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[pmtk]

/retest

[pacevedom]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pacevedom, pmtk

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[openshift-ci]

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