Summary of Changes

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This pull request addresses an inconsistency in how Firestore Project and Database IDs are handled within the Beam SDK. The changes introduce a more robust and explicit mechanism for resolving these IDs when creating Firestore stubs and making API requests. This ensures that the correct project and database are consistently targeted, improving reliability and configurability, particularly in testing environments.

Highlights

• Refactored FirestoreStub Creation: Introduced an overloaded getFirestoreStub method in FirestoreStatefulComponentFactory that accepts explicit configuredProjectId and configuredDatabaseId parameters, allowing for more precise control over the target Firestore instance.
• Enhanced Project and Database ID Resolution: The logic for constructing the x-goog-request-params header has been improved to prioritize explicitly provided project and database IDs, falling back to FirestoreOptions and then GcpOptions for the project ID, ensuring consistent and predictable ID usage.
• Explicit ID Usage in FirestoreV1WriteFn: The FirestoreV1WriteFn now utilizes the new getFirestoreStub method, passing the resolved project and database IDs directly, which aligns its behavior with the updated ID resolution mechanism.
• Updated Firestore Testing Helper: The FirestoreTestingHelper has been modified to accept an explicit database ID during its instantiation, enabling more flexible and accurate testing scenarios that reflect the new ID handling logic.

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