fix(auth): move select imports to internal

[ncooke3]

One difference FirebaseAuth had was not using internal imports:

nickcooke@nickcooke-mac2 firebase-ios-sdk (main) % git grep "import FirebaseCoreExtension"
FirebaseAI/Sources/AILog.swift:internal import FirebaseCoreExtension
FirebaseAI/Sources/FirebaseAI.swift:internal import FirebaseCoreExtension
FirebaseAI/Tests/Unit/VertexComponentTests.swift:internal import FirebaseCoreExtension
FirebaseAppCheck/Tests/Unit/Swift/AppAttestProviderFactoryTests.swift:internal import FirebaseCoreExtension
FirebaseAppDistributionInternal/Sources/Internal/Logger.swift:internal import FirebaseCoreExtension
🚨 FirebaseAuth/Sources/Swift/Auth/Auth.swift:import FirebaseCoreExtension
🚨 FirebaseAuth/Sources/Swift/Auth/AuthComponent.swift:import FirebaseCoreExtension
🚨 FirebaseAuth/Sources/Swift/Backend/AuthBackend.swift:import FirebaseCoreExtension
🚨 FirebaseAuth/Sources/Swift/Backend/AuthBackendRPCIssuer.swift:import FirebaseCoreExtension
🚨 FirebaseAuth/Sources/Swift/Backend/AuthRequestConfiguration.swift:import FirebaseCoreExtension
🚨 FirebaseAuth/Sources/Swift/Storage/AuthKeychainServices.swift:import FirebaseCoreExtension
🚨  FirebaseAuth/Sources/Swift/Utilities/AuthLog.swift:import FirebaseCoreExtension
FirebaseAuth/Tests/Unit/AuthBackendTests.swift:import FirebaseCoreExtension
FirebaseFunctions/Sources/Functions.swift:internal import FirebaseCoreExtension
FirebaseMLModelDownloader/Sources/DeviceLogger.swift:internal import FirebaseCoreExtension
FirebaseSessions/Sources/FirebaseSessions.swift:internal import FirebaseCoreExtension
FirebaseSessions/Sources/Logger.swift:internal import FirebaseCoreExtension
FirebaseSessions/SourcesObjC/NanoPB/FIRSESNanoPBHelpers.m:@import FirebaseCoreExtension;
FirebaseSessions/Tests/TestApp/Shared/MockSubscriberSDK.swift:internal import FirebaseCoreExtension
FirebaseStorage/Sources/Internal/StorageTokenAuthorizer.swift:internal import FirebaseCoreExtension
FirebaseStorage/Sources/Storage.swift:internal import FirebaseCoreExtension
Firestore/Swift/Source/Codable/DocumentID.swift:internal import FirebaseCoreExtension

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[paulb777]

LGTM on expected test failure