[WIP] Add e2e test for HorizontalPodAutoscaler

[karlkfi]

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[google-oss-prow]

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[google-oss-prow]

@karlkfi: 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
kpt-config-sync-presubmit	e46f4af	link	true	/test kpt-config-sync-presubmit

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