Change node name to env value of HOSTNAME_OVERRIDE

[notpad]

What type of PR is this?

/kind bug

What this PR does / why we need it:

KUBELET_HOST is used to specify the IP address for the Kubelet to serve on.
HOSTNAME_OVERRIDE is used as identification instead of the actual hostname.
So we should use HOSTNAME_OVERRIDE instead of KUBELET_HOST to "grep" in the "kubectl get node" command.

Which issue(s) this PR fixes:

Fixes #83985

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Hi @notpad. Thanks for your PR.

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[notpad]

/sig testing
/priority important-soon

[notpad]

/assign @SataQiu

[BenTheElder]

/uncc
/uncc @fejta
/cc @SataQiu

[ramineni]

/ok-to-test

[ramineni]

/cc @dims

[notpad]

/test pull-kubernetes-kubemark-e2e-gce-big

[dims]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims, notpad

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