script: Use instance zone instead of cluster location in setup-local script

[arvindbr8]

Fixes a bug that prevented the script from working with regional clusters.

Previously, the script incorrectly used the cluster's region as the instance group zone. This change now extracts the correct zone from the instance group's URL, ensuring compatibility with regional clusters.

[k8s-ci-robot]

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Hi @arvindbr8. Thanks for your PR.

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[swetharepakula]

/ok-to-test

[gauravkghildiyal]

Thank you for the improvement

[gauravkghildiyal]

nit: Maybe change the variables to "cluster" since we really want this to have one value and use it in that manner in the rest of the script.

[arvindbr8]

Makes sense. A followup to that: why do we use a gcloud container clusters list, instead of gcloud container clusters describe? That way we can get rid of the -gt 1 check and check for $? instead?