Fix copy images job

[timebertt]

What this PR does / why we need it:

Previously, the copy-images job failed to copy one of the configured images: https://prow.gardener.cloud/view/gs/gardener-prow/logs/post-ci-infra-copy-images/1638492793884119040
This PR

• fixes the configuration (images.yaml)
• makes the job fail if a single operation fails
• highlights the Error: log lines

Which issue(s) this PR fixes:
Part of #619

[timebertt]

/kind bug

[oliver-goetz]

/kind enhancement
/approve
/lgtm

[gardener-prow]

LGTM label has been added.

Git tree hash: 9da5e5ead87992c378b1970128acb6118297f436

[gardener-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: oliver-goetz

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[gardener-prow]

@timebertt: Updated the config configmap in namespace prow at cluster gardener-prow-trusted using the following files:

• key config.yaml using file config/prow/config.yaml

In response to this:

What this PR does / why we need it:

Previously, the copy-images job failed to copy one of the configured images: https://prow.gardener.cloud/view/gs/gardener-prow/logs/post-ci-infra-copy-images/1638492793884119040
This PR

• fixes the configuration (images.yaml)
• makes the job fail if a single operation fails
• highlights the Error: log lines

Which issue(s) this PR fixes:
Part of #619

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