DTSPO-18332 - Test postgres-setup script

[louisehuyton]

Jira link

DTSPO-18332

Change description

Test postgres-setup script

Testing done

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

🤖AEP PR SUMMARY🤖

• Created a new file toffee-postgres-config.yaml with Flexible Servers Configuration for PostgreSQL, including metadata and specifications.
• Created a new file toffee-postgres.yaml with specifications for a Flexible Server for PostgreSQL.
• Created a new file kustomization.yaml for managing resources with Kustomize, including a reference to recipe-backend-postgres.enc.yaml.
• Created a new encrypted file recipe-backend-values.enc.yaml for managing secrets related to PostgreSQL, including metadata and encryption details.

[louisehuyton]

closing pr, going to recreate with linting fix in place