[Infra] Upgrade to FirebaseUI v15

[ncooke3]

Unrelated to access tokens, but the only thing keeping firebase-ios-sdk prerelease and release workflows from passing at this point.

[gemini-code-assist]

Summary of Changes

Hello @ncooke3, 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!

I've updated the FirebaseUI dependency across the database, firestore, and functions example projects to version 15.0. This upgrade is critical as it resolves issues preventing the firebase-ios-sdk prerelease and release workflows from passing, ensuring the stability and progress of our CI/CD pipelines. The changes primarily involve updating CocoaPods specifications and their corresponding lock files.

Highlights

• FirebaseUI Version Upgrade: I've upgraded the FirebaseUI dependency across the database, firestore, and functions example projects from version ~> 14.0 to ~> 15.0 in their respective Podfile configurations.
• Dependency Lock File Updates: The Podfile.lock files for each affected project have been updated to reflect the new FirebaseUI component versions (e.g., FirebaseDatabaseUI to 15.1.0, FirebaseAuthUI to 15.1.0, FirebaseEmailAuthUI to 15.1.0, FirebaseGoogleAuthUI to 15.1.0). These updates also include adjustments to transitive dependency version constraints, such as FirebaseAuth and FirebaseDatabase.
• GoogleSignIn and AppCheckCore Integration: Specifically within the functions/LegacyFunctionsQuickstart project, the GoogleSignIn dependency has been upgraded from 7.1.0 to 8.0.0, which in turn introduces AppCheckCore as a new required dependency.

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[gemini-code-assist]

Code Review

This pull request upgrades FirebaseUI from version 14 to 15 across multiple example projects. It's recommended to test the application to ensure compatibility with the new versions.

[gemini-code-assist]

This pull request updates the FirebaseUI/Database dependency to version 15. Consider testing the application to ensure compatibility with the new version.

[gemini-code-assist]

This pull request updates the FirebaseUI/Auth and FirebaseUI/Email dependencies to version 15. Consider testing the application to ensure compatibility with the new versions.

[gemini-code-assist]

This pull request updates the FirebaseUI/Auth and FirebaseUI/Google dependencies to version 15. Consider testing the application to ensure compatibility with the new versions.