[konflux] Fail when SBOMs can't be accessed (update)

[ashwindasr]

Follows #1166

Includes Sid's suggestion: #1166 (comment)

[openshift-ci]

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[openshift-ci]

@ashwindasr: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/security	74b9a3e	link	false	/test security

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[thegreyd]

/lgtm