feat(common): Add utoipa attribute macro types

[fussybeaver]

Description of change

This is a re-opening of #1924 for internal API testing needs.

How has this been tested? (if applicable)

This is being used to create API tests for the backend API platform.

[greptile-apps]

PR Summary

Added OpenAPI schema generation capabilities across the common module by implementing utoipa attribute macros for data structures.

• Added utoipa crate as an optional dependency in common/Cargo.toml with chrono feature enabled
• Added #[cfg_attr(feature = "utoipa", derive(utoipa::ToSchema))] to key data structures in models and secrets modules
• Missing utoipa attribute on DeleteCertificateRequest struct in certificate.rs should be added for consistency

Note: This review focuses on the most recent changes and does not repeat points from previous reviews.

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[greptile-apps]

PR Summary

(updates since last review)

This PR updates the Secret type implementation to include OpenAPI schema generation support and consolidates utoipa dependency management at the workspace level.

• Added #[schema(value_type = String, format = Password)] to Secret struct in common/src/secrets.rs for proper OpenAPI documentation
• Moved utoipa dependency from direct version to workspace-managed version in common/Cargo.toml
• Added utoipa feature flag in common/Cargo.toml to make the OpenAPI schema generation optional

The changes look focused and well-structured, maintaining the security aspects of the Secret type while adding API documentation capabilities.

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