Update FDC local toolkit to v2.15.0

[lisajian]

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[gemini-code-assist]

Summary of Changes

Hello @lisajian, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on upgrading the Firebase Data Connect (FDC) local toolkit to version 2.15.0. This update ensures that the Firebase CLI is configured to download and use the latest Data Connect emulator binaries, bringing the most recent features and stability improvements to local development environments. The changes primarily involve updating configuration metadata for the emulator downloads and noting a specific improvement in Dart-generated code.

Highlights

• FDC Local Toolkit Update: The Firebase Data Connect (FDC) local toolkit has been updated to version 2.15.0 across all supported platforms (Darwin, Win32, Linux).
• Emulator Binary Information: The downloadableEmulatorInfo.json file now reflects the new version, including updated expected sizes, MD5 and SHA256 checksums, and remote download URLs for the Data Connect emulator binaries.
• Dart Generated Objects: A new changelog entry indicates that Dart generated objects now utilize Object.hashAll() for hashing.

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[gemini-code-assist]

Code Review

This pull request updates the Data Connect local toolkit to version 2.15.0. The changes correctly update the emulator download details in src/emulator/downloadableEmulatorInfo.json and add a corresponding entry to CHANGELOG.md. The changes look good, with just one minor suggestion for consistency in the changelog.

[gemini-code-assist]

For consistency with other entries in this file, please consider adding a reference to the corresponding pull request or issue number for this change, if one is available.