fix(auth,ios): fixes inappropriate linking when host is nil

[yjb94]

Description

I have a universal link that has nothing to do with firebase. but when i link into the url, the link has nil url host and falls into the generated expo prebuild linking code and returns NO. which is inappropriate and needed that url to pass to the very bottom of the linking delegate code.

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
  • 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

you can test with url with nullable(nil) url host. in my case, i tested with a custom universal link that has nothing to do with firebase app

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 7, 2025 7:53am

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