Fix ibmcloud-secret-rotator CLI to apply --region before instance

[sudharshanibm]

This change fixes an issue where the ibmcloud-secret-rotator CronJob was attempting to contact the us-south Secrets Manager endpoint, even though the Secrets Manager instance is provisioned in eu-de, causing repeated DNS resolution failures.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sudharshanibm, upodroid

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