WIP feat(fcm): Add Support for AndroidConfigV2

[jonathanedey]

• Add androidV2 property to BaseMessage and MulticastMessage interfaces
• Introduce AndroidConfigV2, AndroidRemoteNotificationConfig, and AndroidBackgroundSyncConfig types
• Implement validation for androidV2 properties, including nested remoteNotification and backgroundSync exclusivity constraints
• Enforce mutual exclusivity between legacy android and new androidV2 payload configurations
• Add unit tests validating androidV2 property serialization, types, and error constraints
• Export new V2 interfaces

[gemini-code-assist]

Code Review

This pull request introduces the Android V2 configuration (androidV2) for Firebase Cloud Messaging (FCM) payloads, supporting remote notifications and background sync. It includes new TypeScript interfaces, validation logic, and comprehensive unit tests. The feedback suggests refactoring the validateAndroidConfigV2 function to use the existing renameProperties utility for renaming remoteNotification and backgroundSync properties, which would improve consistency and simplify the code.

[jonathanedey]

/gemini review

[gemini-code-assist]

Warning

Gemini encountered an error creating the review. You can try again by commenting /gemini review.

[jonathanedey]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces the new Android Config V2 (androidV2) to the Firebase Admin Messaging API, deprecating the legacy android configuration. It adds several new interfaces and types to support remote notifications and background sync configurations, along with their corresponding validation logic and unit tests. Feedback on the changes highlights that the validateLightSettings helper function contains hardcoded error messages referencing the legacy android.notification path, which will produce misleading error messages when validation fails for androidV2 payloads.