This is a clone of issue OCPBUGS-33898. The following is the description of the original issue:
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The mockup output does not contain the version the cluster is being upgraded to. Existing CVO condition shows it, so we should find a place for it in the output (or explicitly decide we dont want it)

Definition of Done: 

oc adm upgrade status tells that cluster is upgrading from x'.y'.z' (to partial intermediate version...) to x.y.z version.

For example, with a history like:

• Completed 4.15.0
• Partial 4.15.2
• Partial 4.15.3
• Completed 4.15.5

we might show something that mentioned 4.15.0, 4.15.2, 4.15.3, and 4.15.5. Or we could decide that those mid-update retargets are rare enough to not be worth spending code-time on, and only mention 4.15.0 and 4.15.5?