fix: change the inferenceobjective to use v1 inferencepool

[capri-xiyue]

change the inferenceobjective to use v1 inferencepool to match the https://github.com/kubernetes-sigs/gateway-api-inference-extension/blob/main/config/manifests/inferencepool-resources.yaml#L6

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: capri-xiyue
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[k8s-ci-robot]

Hi @capri-xiyue. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[capri-xiyue]

/assign @liu-cong

[liu-cong]

/lgtm

[liu-cong]

/ok-to-test