Update TTL for prow_secret in secrets manager modules

[sudharshanibm]

Changes Made:

• k8s-s390x-conformance from 4hrs to 12hrs to better align with required secret rotation policies.
• Added --region eu-de flag and IBMCLOUD_REGION=eu-de environment variable to ensure the CLI uses the correct regional endpoint.

Reason for these changes:

While debugging recent failures in the ibmcloud-secret-rotator cronJob, noticed that the Secrets Manager CLI was defaulting to the us-south endpoint, even though the Secrets Manager instance is provisioned in eu-de

This resulted in DNS resolution failures like:

go: downloading github.com/go-playground/locales v0.14.1
Error: Get "https://0664d47c-fe42-423f-930d-69570443cd15.us-south.secrets-manager.appdomain.cloud/api/v2/secrets?limit=10&match_all_labels=rotate%3Atrue&secret_types=iam_credentials": dial tcp: lookup 0664d47c-fe42-423f-930d-69570443cd15.us-south.secrets-manager.appdomain.cloud on 10.96.0.10:53: no such host

the CronJob and Helm config already assume eu-de, but the CLI falls back to us-south unless explicitly specified.

[k8s-ci-robot]

Hi @sudharshanibm. Thanks for your PR.

I'm waiting for a kubernetes 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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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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