NFDIV-4237 Remove Cron Config

[BWeeks-JusticeGovUK]

https://tools.hmcts.net/jira/browse/NFDIV-4237

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ℹ️ Deleted the following files:

• image-policy.yaml
• image-repo.yaml
• nfdiv-cron-regen-citizen-aos-response-pack.yaml
• prod.yaml

The kustomization.yaml file was updated to remove the reference to the nfdiv-cron-regen-citizen-aos-response-pack files.