[NFDIV-4080] Flux config for NFDIV CCD case migration

[adamg-hmcts]

Jira link (if applicable)

https://tools.hmcts.net/jira/browse/NFDIV-4080

Change description

Flux config to start testing the migration in AAT. The nfdiv case migration repository with the migration code is available here: https://github.com/hmcts/nfdiv-ccd-data-migration-tool

Checklist

• [ ] commit messages are meaningful and follow good commit message guidelines
• [ ] README and other documentation has been updated / added (if needed)
• [ ] tests have been updated / new tests has been added (if needed)
• [ ] Does this PR introduce a breaking change

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Changes in apps/nfdiv/aat/base/kustomization.yaml

• Added a reference to the nfdiv-ccd-case-migration component in the resources list.

Changes in apps/nfdiv/automation/kustomization.yaml

• Added references to nfdiv-ccd-case-migration in the resources list.

Added file apps/nfdiv/nfdiv-ccd-case-migration/aat.yaml

• Added a new file defining the configuration for the nfdiv-ccd-case-migration HelmRelease in the AAT environment.

Added file apps/nfdiv/nfdiv-ccd-case-migration/image-policy.yaml

• Added a new file defining the image policy for nfdiv-ccd-case-migration.

Added file apps/nfdiv/nfdiv-ccd-case-migration/image-repo.yaml

• Added a new file defining the image repository for nfdiv-ccd-case-migration.

Added file apps/nfdiv/nfdiv-ccd-case-migration/nfdiv-ccd-case-migration.yaml

• Added a new file defining the HelmRelease for nfdiv-ccd-case-migration component, including its configuration.

Added file apps/nfdiv/nfdiv-ccd-case-migration/prod.yaml

• Added a new file defining the configuration for the nfdiv-ccd-case-migration HelmRelease in the production environment.