fix: HPA syntax, allow v2 API

[fernandezcuesta]

HPA had apparently an additional field (checked v1 and v2 and none have namespace under scaleTargetRef. Support for HPA v2 added if supported by the target cluster.

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[divyansh-gupta]

Good catch, I don't see namespace here either: https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.28/#crossversionobjectreference-v2-autoscaling. Please go ahead and make the change Brady requested and we will approve the PR for testing.

[jetstack-bot]

PR needs rebase.

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[bmsiegel]

#335 has been merged, closing this one as duplicate