fix(auth): Fix auth type definitions and add more

[MichaelVerdon]

Description

Added and edited type definitions to match Firebase JS-SDK with tests for definitions. Furthermore, this should fix this issue

Closes #8368
Closes #8311

Related issues

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
• 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

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 23, 2025 4:45pm

[CLAassistant]

All committers have signed the CLA.

[mikehardy]

LGTM - I reviewed current status, fixed conflicts, and handled the tiny remaining feedback from PR review of return type in a typedoc. I'd like to merge this as it fixes a lot of user-noticed problems moving to modular API

review comments all handled now