Update s390x ExternalSecret to use dedicated GCP secret

[sudharshanibm]

This PR updates the s390x cluster ExternalSecret configuration to use a dedicated GCP Secret Manager secret (ibm-sm-s390x-apikey)

[k8s-ci-robot]

Hi @sudharshanibm. Thanks for your PR.

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[sudharshanibm]

cc @upodroid

[Rajalakshmi-Girish]

/lgtm

[Prajyot-Parab]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Prajyot-Parab, Rajalakshmi-Girish, sudharshanibm

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• kubernetes/ibm-s390x/OWNERS [Prajyot-Parab,Rajalakshmi-Girish]

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[Prajyot-Parab]

/ok-to-test