🌱 add test for "Enabled Aggregate API for Virtual Cluster"

[Abirdcfly]

What this PR does / why we need it:
Add test for #167
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[k8s-ci-robot]

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[Abirdcfly]

The other thing is that our demo does not work (some issue like #198) because of #167.
Maybe we need to update the docker image in or update the demo documentation to prompt users to build the latest image themselves

[Abirdcfly]

/assign @Fei-Guo

[christopherhein]

/ok-to-test

[christopherhein]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Abirdcfly, christopherhein

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• virtualcluster/OWNERS [christopherhein]

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