fix(app): align iOS constants with generated spec

[huytdps13400]

Description

The generated New Architecture protocols declare constantsToExport and getConstants as ModuleConstants<...::Constants>, while RNFBAppModule and RNFBUtilsModule still implemented ModuleConstants<...::Constants::Builder>. Objective-C++ therefore sees incompatible method return types against the generated spec.

This aligns the four implementation signatures with the generated header without changing the constants dictionaries or runtime behavior. A Jest parity test now compares both implementations against their generated protocols so future codegen changes cannot silently drift.

Related issues

Fixes #9212

Release Summary

Fix iOS New Architecture build errors caused by mismatched TurboModule constants return types.

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/**/e2e
  • jest tests added or updated in packages/**/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

• RED: the new parity test reported Constants::Builder from both implementations versus Constants from both generated protocols.
• yarn tests:jest packages/app/__tests__ --runInBand — 9 suites, 95 tests passed.
• yarn tsc:compile
• yarn workspace @react-native-firebase/app compile
• yarn eslint packages/app/__tests__/iosConstantsReturnTypeParity.test.ts --max-warnings=0
• yarn prettier --check packages/app/__tests__/iosConstantsReturnTypeParity.test.ts
• yarn lint:ios:check
• yarn codegen:verify — regenerated all configured Android/iOS artifacts with no drift.

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