Update the existing mock APIs

[vickybesra]

Reason/Context

Ensure mocks are reliable and aligned with modern API standards.

Description

• Update YAML artifacts for mocking the API to the latest version.
• Revise schema definitions, example references, and error responses to follow current best practices.

Implementation ideas

1. Compare current YAML artifacts with the latest standards.
2. Update schema and examples accordingly.
3. Validate changes using tools like Swagger Editor and Postman.
4. Document any breaking changes and provide migration guidelines.

[github-actions]

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