Fix empty describedObject in hpa status

[mchtech]

What type of PR is this?

/kind bug

What this PR does / why we need it:

hpa.status.currentMetrics[*].object.describedObject is empty when hpa.spec.metrics[*].object.target.type is AverageValue

(same as PR #104729)

fixes this bug and adds a test.

Which issue(s) this PR fixes:

Fixes what PR #104729 wants to fix.

Does this PR introduce a user-facing change?

NONE

[linux-foundation-easycla]

• ✅login: mchtech / (94e6235)
• ✅login: mchtech / (94e6235, 9bf3f02)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mchtech
Once this PR has been reviewed and has the lgtm label, please assign mwielgus for approval. For more information see the Kubernetes Code Review Process.

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