docs(messaging): add remote notification to Expo config

[ceafive]

Description

How to add remote notification to Expo config for those who need it

Related issues

Fixes #8167

Release Summary

Update docs on how to add remote notification for Expo managed workflow

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	Jan 5, 2025 9:54am

[ceafive]

@mikehardy